I see what you mean with that however, I doubt that… if I were you… I still exist as capable to be myself… Prior to what you call awkward phrasing, there seems to be awkward logic.

Anyway… Talking genenerally, to solve this logical problem of identical pronouns, you just… change the second pronoun for what it represents (“un type / une personne / un homme / une femme + comme moi”, “MyName” or whatever of the kind) and postposition it :

” Si j’étais toi, je ne me mettrais pas à dos un type comme moi. “

” Si j’étais toi, je ne me mettrais pas aCOSwt à dos. “

Apart from this, please note that “Si j’étais toi” fits better here than “Si je me trouvais à ta place” and please do not forget the negation.