Yeah, the Houseguests was before the Complete Strangers. They released the single Fun In Your Thang as “Bootsy Phelps and the Complete Strangers” in 1972, not sure if that was before or after they joined p-funk the first time. Probably after.
Between AEIY and Up for the Downstroke they also released Together In Heaven as “Bootsy Phelps And Gary”. That’s Together that was remaded on Chocolate City.
The liner notes on that My Mind Set Me Free vinyl don’t talk a lot about what happend after the Houseguests. But love that vinyl! If anybody missed it, here’s the topic on that album. The liner notes are there too. You can read them if you download and zoom in 
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I wasn’t aware that he did any session with James after that. What recordings did that end up on?