Well, there's a lot to be said about Victor, and he's definitely an interesting character, but first off...
Once he entered his mid-twenties it would become noticeable
Is he really that young? It makes sense physiologically, but still. He's been around for a for a while and just also commented on being one of the keys to the Empires rise as more then just a gang. The E88 is clearly a lot older then him too, but Keiser's reign hasn't been a short one either. And while the Herren clans are definitely screwed enough to be arranging marriages for pre-teens...I doubt there was a middle-schooler Victor seeking to ingratiate himself to power, or getting powers and then responsibility of all the core organization of a well established gang.
I know he's older then Othala, but I could have sworn it was more like they married when she was a teenager, and now she's somewhere in the twenties while he's in the thirties.
As for the FMA hints...like there's, all kinds of bad-end flags, but realistically things shouldn't go that way? Unlike pretty much all actual alchemists, Victor know a lot more about a lot more things. And stuff like what makes a person a person? Soul, or patterns and information, that still has to come from .
somewhere. And also unlike the source material, that elusive store of Parahuman 'data' has quite a number of potential leads, the very biggest of which is right there in the Bay (not that he'd be going to Apeiron unless he's desperate...but a lot of things could change quickly, and it's clear already that he's losing ties to the Empire and implied his own nature keeps him too aware to truly buy in to race rhetoric). Regardless though, the very biggest factor is all those self-control and analysis skills he already mentioned. There isn't going to be any taboo 'human' alchemy done until he's certain it'll work, no emotionally rushing off half-cocked for him. As a non-physical skill he's got years to experiment, investigate the nature of Parahumans, and try to nibble some more bits of Alchemy from Lethe. And all the stolen self-control and patience to actually use that time.
Very quickly though, it should become apparent that the body isn't the real issue - not when there are other Tinkers out there and mundane advancement into cloning to make acquiring a body the 'easy' part. The real issue is the information. Parahuman powers indicate that at least for other parahumans it is stored somewhere resistant to physical demise, but how do you access it? And how do you transfer it to another body? For those questions Alchemy flat out CAN'T answer the first, and for the second soul manipulation seems like the sort of esoterica that he didn't grab from Aisha (not sure she's even learned that yet), and that has no equivalent or lead in other sciences to base things off of.
At that point he might keep looking, but actual success would hinge on the Thinker net making a major breakthrough on powers (not friggin likely with Cauldron and maybe their own shards cleaning that info up), or he starts to cooperate with the Forge down the line (the Empire seems poised to collapse, and as an ambitious young man that wants more, is sick of the Gesselschafts nepotism, and would need protection as an unenhanced human with an equally fragile wife with no small number of enemies from being a friggin Nazi? Appealing to the major power of the city is definitely a possibility, and Victor does have a lot to offer (from his perspective), even if his power and past quite solidly eliminate actually being part of the team.
And presuming there is such a future, he could even 'sell' the idea with the fact that there are a lot of dead heroes out there too, not to mention people willing to pay to make them not dead. For a good-leaning mercenary like Apeiron is by rep, cooperating to work out a Parahuman revivification process at the cost of reviving a specific non-crazy Parahuman, and/or whatever assets Victor is able to salvage from the Empire or build up himself...well. Just saying there's not no case in the future, not for a person with Victor's skills in communication and negotiation (mind-control immunity kinda can't protect against a compelling argument).
Edit: If anything, being a Parahuman in Bet makes him less likely to get hit by a 'Toll'. Alchemists in Central had no clue if people truly had souls or where a person's information went, didn't know enough about brains to know consciousness is a continuous pattern and not just the meat (that they seem to rely on some sort of intent-based cludging to cover the finicky details of making trillions of cells anyway, which is probably part of the problem when it comes to things that can't be filled in by the user's knowledge or creativity), and were desperate enough to yolo it anyway and thus meet Truth.
But as there is an actual lead for the 'soul' on Earth Bet? Victor might make some brain-dead proof of concepts, but the full thing will definitely wait until he's actually got a lock on her information.