Floridasnook; This is question of notch toughness testing is something I've asked some B2 Committee members myself.
To the best of my knowledge, none of the SWPS are qualified by notch toughness tests so, my question was "could an SWPS be used to perform a coupon, and then simply do the notch tests?" - I havent received an asnwer as of yet. If we were following ASME IX Rules, the answer would be yes.
Second question, there would be likely little, or no different between a WPS with or without notch toughness testing with the exception of it being supported by the notch toughness testing.
In my opinion, an SWPS would be valid for use with B31.3 normal fluid service temperature after it has been properly demonstrated. It's certain valid for use within the B&PV constructing codes.