Thanks James for the background on this. If you were here in the States, I would be happy to lend you one of my RTX cards. With so many people at home these days, prices are much higher than they should be at this point in the RTX 20x0 series' lifecycle. Hopefully you'll be able to get a card, even if it's an original 2060.
If you want to send me builds to test, I'm happy to do that. Doing the testing in order to possibly get Optix support sooner is worth it for me.
Have you been in touch with the Blender Devs on insights in how to implement? Maybe they would be willing to test too?