Your Alma 10 read looks right (the 9.0 demonstrator is Xen 4.19 with a dom0 loosely based on AlmaLinux 10 and a 6.12 kernel), but @yann said in July they're out of prototyping and rebuilding the foundations component by component, so I wouldn't treat that kernel as the one their driver ends up targeting.
On the packaging side, the kernel module policy page is the nearest thing I've found to an answer for what you'd need to pull together: https://docs.xcp-ng.org/project/development-process/kernel-module-policy

For VROC, my understanding is that it sits on VMD, though I could have that backwards. VMD stalled boot on the demonstrator kernel back in January until yann said he'd include a patch for it, so that stretch of the thread is worth a read before your call: https://xcp-ng.org/forum/topic/11698

I don't know enough about driver packaging to say what Vates would actually need from GRAID, so it might be worth pulling in @Team-Hypervisor-Kernel, since drivers are their scope.
If the call gives you a list of what they need from our side, that's probably the most useful thing to bring back here.