I received some reccs for speed + K as a combo for clubbing, apparently the phet balances nicely with low-dose K. As I'm out of phet, I was going to use 3 as the next best available. The expectation would be for a stimulating edge added to the K drunkenness, or alternately the K serves to smoosh out the 3-FPM stimulation. The idea is to not take enough k to actually be significantly dissociated, and I am fairly confident I can dose to that goal accurately as I have done so before, and get the euphoric and messy side of K balanced with a stim kick to get me up, dancing and sociable. I do find 3 gives enough physical stimulation to serve for this purpose for me, incidentally.
Based on the accounts of phet going well with speed, I suspect the K DRI effect is not strong enough to significantly kill stim effects.