time to use 'silent dm's! you should be able to derive a unique pub for a session from a pub with a tweak and send the 'notification dm' from a throwaway pub... or something like that.
Discussion
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so lemme put the thinkboi hat on...
K = kG
K' = K+sG = (k+s)G so if i send s to K then he can calc the private key k' to the new silent pub K' i made for him, but i can't, because i don't know k right?
so all people observing this would see is that a pub they never seen before initiated a DM to K but there was never any reply. then some other new pub dms with a new pub... š¤