Diva, I think you've got some excellent advice, guidance, tips and so forth.
You seem to know what you want, what you can handle and what you can't stomach.
So my advice would be to go for it.
But at a pace that feels safe for you.
And if you feel that you've given it a shot, and it just wont work, then by all means walk away, at least you gave the relationship a chance and didn't just run because BPD said so.
(I nearly did that again yesterday lol 😁 but luckily my DBT skills kicked in, and I realized I was just scared of the unknown)
Best of luck with whatever you decide, just remember its important to remain true to yourself.