“Not everyone agrees on that aspect (i.e. the auto 1000 yr ban).”
The Shulchan Aruch says Cherem Rabbeinu Gershom was set to expire on Year 5000. (Not 1000 years since it was issued.)
“I have been approached more than once to sign on a Heter”
You’re a lomdim miflagim and are able to Pasken?
“The “halachicly valid cause” nowadays has been stretched way beyond the realm of Halacha…”
You make it sound like HMRs are very common these days and many of them have been issued on a stretch of legitimacy. How would you know this?
“Hmm am not sure the ידין ידין indicates anything regarding knowing a bit Even Ha’ezer…”
However the signatories know Even Ha’ezer… with or without smicha.