Is it POSSIBLE that Flo could have stayed with the Supremes as a recording member, and Cindy could have joined as a touring member?

It seems the majority of Flo's "issues" were on the "road". The concept of recording/touring members isn't completely foreign to Motown; Claudette from the Miracles and Georgeanna of the Marvelettes are two examples of group members that were strictly recording, not touring.