I'm not very motivated to start a lengthy process if the monastery was not capable to hash the passwords in the first place.
Then don't. But don't then complain when others take the same attitude.
I need to know the main mailing interface of PM.
That's the sort of thing I was referring to when I said I'd help with any interfacing to the framework. Since I'm helping you, we'll use my preferred way. ;-)
I would need a Dev environment to test effectively.
Not going to happen (unfortunately). Is it a deal-breaker?
Do I have the possibility to copy code into a node and run it directly?
I will make you a new htmlcode node. You submit patches to it.