Dsc @ 60. I don’t have the crossword with me but if memory serves, when your substitutions make 36 look like a non-word hold your nerve and complete the final stage.
For anyone mildly troubled by temporary non-words, I commend today’s EV (1468) 43 “misprints” and a final transform with real words all the way. A
chef d’oeuvre from proXimal. And very “satisfying”!