Yeah, you can get Stewart with Pritchard, Kornet, and the end of the bench guys. You can also use the TPE and get some of those end bench types back.
I'd probably do the trade and use 2 1st's if we got Sasser along with Stewart.
Not really interested in trading Pritchard. After a tough start, he's been playing a big role off the bench. I think his and Hauser's shooting are too important to give up for a big that probably won't play all that much if Kristaps and Horford are healthy in the playoffs.
that is why you have to get Sasser back or it doesn't make sense.
essentially the two trades are combined something like this
Stewart, Sasser, Livers, Umude for Pritchard, Kornet, Brisset, Svi, Stevens, Bos 24 1st, GS 1st (and maybe you protect the GS pick such that if it is in the lottery, you just trade the Bos 25 1st instead)
I'd probably do that as I think Sasser provides most of what Pritchard does right now (sasser is shooting 42.5% from 3 on 3 attempts, so he even does that better), but as a 1st round rookie you have 4 years of cheap control when you'd expect improvement such that I believe he will be a lot better than Pritchard over the next 4 years and is a lot cheaper.
So post trade
you essentially just swap Pritchard and Kornet for Sasser and Stewart. That seems like a pretty solid upgrade in the short term with a lot more long-term potential. Umude also seems like he could find a role in a shooting lineup situation as he has been money from deep this year at 51.9% (obviously not a huge sample, but just under 2 shots in 15 games isn't nothing either).