DaasYochid,
Assuming that, as Reb Doniel reports, Rabbi Druckman is a talmid chacham and moreh horaah, you would have to trust him that it was not objectively insincere at the time he was megayer them.
Bear,
As Daas Yochid said, kabbolas mitzvos doesn’t mean that you are saying you will never do an aveira l’tayovon. It means you are m’kabel the ol mitzvos and will try to keep them. Having, rachmana l’tzlan, a tayva for MZ is not a bar to becoming a Ger. Nor is believing Judaism “cool.”
Also, I have meant many fine, frum geirie tzedek from modern times.