Next gen replaceable light engines?

Any pics? I tried to look up Armytek but found only a few pics where leads are soldered. But the come through rivets - maybe that’s what you mean? Also - yeah, there’s no centering ring.

Actually now that I think about it - centering ring is not needed. Correct profiling of the reflector base is enough.
And this opens up a good way to do good thermal transfer to the reflector. Which may enable improving thermal transfer to fins in the front of the head. And also add some thermal mass, alu stores heat well. But at the same time - heating up reflector base will make it expand. It will be hotter than the front so the expansion will be uneven which will affect reflector shape. Is that meaningful?

I would not be concerned about mod-unfriendly makers. Yes, they are unlikely to adopt any kind of standard. I don’t think their participation is necessary.