I’m definitely not the expert in this area. There are definitely more situations- I picked a simple one (e.g. where she is in a vegetative state or disappeared) and a difficult one (e.g. where she’s disputing that the marriage is over, claims everything he said is untrue and claims that for the kids sake they should stay together and each Rov needs to thoroughly investigate the case and decide if he should sign on or not). Of course there are many situations in between.
I was under the impression that the signatories have to be in 100 different cities in 3 different countries or continents and I honestly have no idea if they each need to sign the same document in person or if an email will suffice.
I’m not trying to nitpick your post but aside from the mesader at a future wedding (which could easily be anyone) his future wife also needs to agree that it’s valid. It would be a shame to get a heter and then get engaged only to find out that his future wife wants it done differently and he needs to start all over again.