I have thought it through and it is a long shot. You are right that most creators are catering to a large audience with fantasy and warhammer type figures. You are trying to put words in my mouth that I am not saying however. I am not saying to do it. I am asking is it worth considering? I will let other people with the knowledge on how to get products developed and to market make the decision on if to do it.
As for 3d Printing... I have had excellent results with my $189 printer for over 2 years using resin that cleans up with water and cures in sunlight. I have added a small uv curing station from Amazon for about $30 I believe just for convenience. Ventilation is not an issue with flexible dryer duct tube, a inline fan, and a window. So yes, there are some extras that are needed. Just like pencils, paper, and dice are needed for playing an RPG.
At this point I am done. To discuss it further with you is futile as you have your opinion that it is not worth pursuing and my opinion is to ask if the idea is worth exploring. It isn't for me to say yay or nay about if it happens