I just don't know how these are going to get finished.
1) You have to have access to a machine that someone is willing to have 'the closer' to crawl all over their precious pinball artifact.
2) you have to have someone with electrical and software skills that has 1-3 months spare time on their hands to go visit said machine, aka 'the closer'. This could be conservative as some of these things may never work but take a long time to come to that conclusion.
3) unless 'the closer' is retired, will probably want to get paid. These kinds of skills are worth $100/hr -$150/hr. So $16k- $50k ish on the low side... Without "for the love of pinball's discounts"*. Plus 'the closer' needs access to the source code which may or may not be included with the game and applejuice would have to volunteer it if he is not 'the closer'. *FLOP Discounts may not apply because the person doesn't get their own game out of the project.
4) this fixes one game. Given we see that each game might be a tad different, 'the closer' may have to travel and be paid to troubleshoot any that want to be fixed.
This seems less likely to happen and more wishful thinking in my opinion anyway.