No.
If Max Lord is a villain on SUPERGIRL, then Kara should (and will) be the one to bring him to justice ... because it's HER show and no guest-star should upstage her on that level.
Also: No desire to see a 64+ years old Lynda Carter don Diana's garb (any version) again.
The Wonderverse has to move beyond Lynda Carter as the be-all-end-all, the way the Superverse has to move beyond Christopher Reeve.