No EU complaint panel I know of does this. Honeywell galaxy and vista are not related in any way. The vista is an ademco product, the galaxy/dimension is a microtech one
Anything will do that
Again any proper comms will connect to an EU panel we do it every day, but insurance approval needs nsi etc approval (i note you know this)
Most panels are available as hybrid options allowing rf and hard wired
A hybrid will utilise your existing wiring (assuming enough cores and in tact)
Your biggie issue is nothing professional is designed to connect to Home assistant nativly due to the risks involved in that sector. Your not imho gonna tick all your boxes. You can get the functionality you require just not with HA. So as alyeti says if you list what you need functionalilty wise then that would exclude other products maybe already mentioned