So far, Nostr elders do not seem interested in bridging or breaking the key model, but yes, any platform or protocol could use the pkarr method, and it would almost certainly improve censorship resistance.

My guess is that, once you do something like that, people will just find it easier to use Pubky keys/apps/servers, as they will have all the tools needed to make it easy to maintain your dht records, swap servers when needed, etc, and bridging doesnt seem to usually be a popular feature to maintain.