It doesn't matter: I am speaking of acting in full friendliness to the recipient. Right now someone (such as OP) has the choice either to block you or not block you, whereas having those reposts be done via a separate account opens up a new possibility to not block you the human, but do block those reposts. Of course, it would be your call but I thought I would offer the suggestion as something to ponder:-).
Or maybe the time for all of this is over - as you said somewhere here recently, lemmy.ml is dying off now, unlike when you started, so perhaps the Threadiverse is past the need for this effort to spread things around? I would go so far as to say that if the rest of the Threadiverse cannot survive without posts from lemmy.ml, then that does not bode well for our future? At some point - and perhaps we are there already, it being now 2 years since the Rexodus - we need to either sink or swim on our own?
Edit: fwiw, I personally blocked literally all users from lemmy.ml 9 months ago - going so far as to move to PieFed where I could actually accomplish that aim - and I have enjoyed the Threadiverse much better since then! :-) We'll be fine then, methinks.