The changeover to OpenSSl 3 is going to be very time consuming as even just a rebuild of a package will have some interesting things. For example I rebuilt Falkon with OpenSSl 3 and it works great, however Adblock is not working at all.
I also did a built of Otter with WebEngine enable with OpenSSl 3 which so far works fine however, I do have the following:
Going thru the source you’ll find it here: