the Tridos (both UK and NL) App calls a function for the face verification that doesn’t exist with /e/, no way to fix this currently from /e/s side - Problem with Camera on Triodos Banking App - #2 by tcecyk … Digipass seems like an alternative way for authentication (if available).
for the Starling workaround you propose… a (temporary) domain block that isn’t covered by AP you could use nextdns or rethinkdns for - basically a remote DNS is doing the blocking then.