and Welcome! In a word, yes, there have been successful pain pump situations out there, and on this board, bobinjeffmo has had success with his pump as I recall, although he has not participated much at all this past year.
I am so very sorry you have endured the horrific difficulty with the SCS situations you have lived. As for sitting, I use my cushion for sitting myself as I suffer from permanent nerve damage below the waist, combining SCS and my cushion as the means by which I live without pain meds.
I hope for you the sitting becomes more tolerable once your body settles down from these horrible painful episodes.
Prayin for ya,
Mark56
