Regarding your myQ, get away if you can. You can find an inexpensive HK device from Meross that will likely work for you.
If you want to use HA then you will end up migrating all of your HK devices to be paired with HA and then you can bridge them all (and more) back to HK so your family does not have to learn anything new.

This will be an unpopular suggestion here but why not just go all in on iCloud? It's reasonably inexpensive for not data-hoarding amounts of data, reasonably secure and E2E encrypted. Given the low cost, zero setup if they're already Apple people and lack of admin I think it is ideal for them.
I pay for iCloud storage because I want HomeKit Secure Video cloud storage (I also have a local copy on disk).