There's a hack for MY switches that was supposed to be good but I never heard long term results. Remove the springs
Huh. I didn't think that would work, but I just grabbed the remains of a MY board off the trash pile (was literally just cleaning up the basement and getting rid of stuff that would never be used again) and tried that on a switch. It actually feels a lot like what I would expect a red to feel like, but I don't have any reds to verify. Actuation force feels much lighter than browns (happen to have a browns board hooked up to the computer right now.) Unfortunately this board is for parts only and the cable is... somewhere else (it's actually one that I used to make my gluing jig for keycap mods, so there's a whole mess of stems missing as well) so I can't ripometer it or determine where the actuation point is.
I'm tempted now to take a different MY board and try this, but I have limited free time, I already stole the keycaps from the most likely candidate for a Filco, and don't really have any interest in ultra-light linear switches. However the idea seems valid, if you like such things, the only thing that I would suspect that you would need to do would be to lube the hell out of the sliders because with such low spring force, I imagine that friction would be a significant factor in how well the switches would work. That said, the sliders are much larger than those on the MX switches, so they ought to be less wobbly and have less propensity to jam (although to be fair, I have not had problems with MX switches jamming)
HOWEVER if someone is willing to pay me to do it, I'd consider removing the springs from that G81 board, installing some shiny doubleshots, and shipping it to you for your perusal.