Organize some kind of support system for modders who face financial difficulties and are forced to quit modding and fight for survival.
There are already several such systems: Nexus collects donations for modders, there are quite a few 'donate to a [starving] artist' enterprises like Patreon/Subscribestar/Ko-fi, there are also Kickstarter and alternatives where people beg for money due to all sorts of things, from cancer treatments to criminals shooting them in the head while on vacation.
Any potential money you could get from the OpenXcom community even under the most fortuituous circumstances is going to be tiny, because the userbase just isn't there. Never mind that if we somehow magically did have a system of financial support, there would be a lot of incentive
not to pay out to the poorest, but rather to those who contribute the most. Which won't really change much anything for the worst off.
Modding and even game dev in general are not and have never been an answer to financial problems, short of being a lucky founder/executive. Ask all the devs who sunk their life's savings into a pet project that never saw the daylight...
The solution is to use the free time you spend on modding to try to dig yourself out of that hole (learning new skills, looking for a better job, getting a side hustle, even navigating the bureaucracy to eke out a bit more support in more developed countries), not dig yourself further in.