Priests who married only once should not be much of an issue; they could be accepted under the current Pastoral Provision. Bishops who are married only once may or may not be able to function as bishops (as all bishops in the Catholic and Orthodox churches are celibate), but as priests would also fall under the same provision.
Priests and bishops who have been divorced and remarried, or who were raised in the Catholic Church, left, were ordained, and would be returning could be left with greater issues concerning their ministry.
All of those would certainly have to be taken into consideration.
I believe JP II’s Pastoral Provision only pertains to America and not England. The English Bishops asked for something similar as long as they controlled the procedures. So if my understanding is correct then only the ACA would fall under the Pastoral Provision. The rest of TAC would of have to approach the English Bishops unless the Vatican is taking this up as a whole. Please correct me if I am wrong.