For me, selfhosting is about selfhosting. Using 3rd party options hosted by someone else is not selfhosting by its very definition. A reverse proxy works, and you can trivially use that to host a gazillion websites on the same ip+port due to the magic of a ‘virtual host’
This move is not about "self hosting". They are two services that my clients connect to. Where I am now, with the dodgy power, my clients are complaining that they cannot access the servers. I can not afford to store this much data in a datacenter, so this is the next best way.