But the true crux of the issue is, as was said in the beginning, a matter of scale.
I think a deeper issue here is about selecting the right product.
Pushing down the materials/enchanting cost of RoRs is not terribly meaningful if the cost of labor is 100x that cost. And (a) Alchemist and Jinx's skills are currently unique, and (b) if they were working for maximum profit they could demonstrably make millions per hour, which by opportunity cost sets a price for their labor.
(And equivalently, puts an opportunity cost floor on how much they could do charitably as (the most they could make per hour) * (the efficiency of a chosen charity at getting good done).)
Doing something with more equivalent materials and labor costs would generally be much more efficient. If there is a real requirement for being temporary, that likely means either increasing scale (e.g. a pulse of regeneration, possibly via many weak (fitting in soul gems) metamagic enchantments stacked on a normal regeneration, e.g. using the materia linking mechanism to connect regeneration to a harmless large-AoE ability) or increasing number of charges.
And if they're willing to ditch the temporary-only requirement, there's stuff like
spellzones of healing put under hospitals, or various menhir-type things, ripping open a hole the plane of positive energy,
incantations,
Symbol of Healing +
Permanency (probably works like
Symbol of Death and is active forever) etc.
(If you're making single-use items you're losing one of the primary benefits of crafting over casting, that being that you invest capital now and get a permanent return.)
I suspect the real way to ramp up is using the many, many +skill effects pathfinder and other games offer to give enchanting skill boosts to some sort of trustworthy minions. D&D has strong cooperative crafting rules that should probably allow a hundreds of homunculi or animated objects to follow along with what Alchemist is doing (just get them treated as having the
Cooperative Crafting feat somehow), though it's not clear how multiple systems of crafting and crafting boosting would interact.
(I'm not sure whether mindless creatures could aid/copy crafting, but animal intelligence ones certainly could under Pathfinder rules. There are also various ways to find trustworthy human hires (e.g. various means of detecting peoples' Skills and motivations), but you'd have to find some way to ensure their safety, probably starting with housing them onsite.)
Compared to making rings of regeneration, there are (a) better ways for them to spend their time to make money, and (b) better ways to spend their time to do good, e.g. doing the bloodline curse thing Alchemist used on those vampires, but casting Regeneration through it.
(There may be entirely better approaches for whatever their goal is than crafting
.)
