I don't see how meth is going to help with that. It's either going to make suppressing them even more difficult and miserable for you than it already is, or (what I fear) tip you past a point beyond which you're no longer capable of doing that, and lose control entirely.My borderline tendencies attract me to risky situations, but I have to suppress them so I don't end up in any of the three scenarios you mentioned. It's boring and miserable :/
Don't forget either that BPD makes people prone to psychotic episodes, so there's also the risk that the meth will send you spiralling right into stimulant psychosis.
And that's not even considering the effects taking meth could have on your mood swings/cycling, especially when you're not on a mood stabiliser.