It would be nice if Sapphire PS could be used also as a plugin for Affinity Photo (as a PS plugin). At present this does not work.
Have you tried the steps here? Using Photoshop Plugins in Affinity Photo - Lenscraft
I haven’t but am curious if it works.
Yes, I tried it, but it crashes Affinity Photo 1.10 immediately.
+1 for affinity photo support