How about a hockey trade instead of a Cap-based one?
Isles need a shakeup too, so how about Varlamov and Bellows for Oloffson and Butcher? You get a clear #1 and we get an LD to replace Leddy and a PP sniper who is left-handed (clearly a need for us).
I think VO might be available for a longer-term fix in goal. For a guy like Sorokin (I know he's likely a non-starter in trade talks, don't worry). I don't think VO would be available for a 1-2 year fix in goal.
The issue with Buffalo making a "hockey deal" is that most of the players performing well for us are pieces we want to hold onto (VO, Thompson, Cozens, Okposo, Girgensons, etc) and the pieces that are available (Hinostroza, Bjork, Eakin, etc) are depth pieces in a good team.
As an aside -- if you want an LD from Buffalo, you want Hagg. You don't want Butcher. Holy cow, you don't want Butcher.