Umm,, you have like, this HUGE bias for the Undersider.
Considering joining because of family problem?
Seriously? If you're okay with being criminal, you can easily pickpocket people.
Even at 10 ft (that's around 3 meters, right?) you can just go into a crowd, ensure that some people 'drop' their wallet, and conspicuously moved it to your hand.
On the other hand, you can farm gold from seawater. There's like 1 mg gold per tonne of seawater.
Learn to fine tune it, and you can just walk around on a beach, and go back home with 10 gram of gold or such that for every hour (?) depending on how far did you take your practice.
IIRC, un-nerfed psychokinetic of worm CYOA can literally change the atomic structure, changing any gas in our atmosphere into precious metal easily.
Just filtering gold from seawater is easy peasy, even if nerfed like that.
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I give this alternate solution for MC's money problem because the reason for him to join Undersider is very contrived.
This has the beginning of a good idea, please keep working on it.