I will try to do this just for fun, as "realistically" As possible, Flame away!
Bo Horvat Trade - for a "Rental" He Should get a late 1st Rounder + a "good" B Prospect, and a Mid/Late Pick.
Horvat (Sign and Trade) - Should go for a 1st Rounder + Great "A" Prospect and a 2nd Rounder.
Tyler Myers - If the Canucks decide to "eat" 50% of his Cap space, I do think he can get 2nd + Decent Prospect.
If not, I Think a 3rd Rounder would probably get it done, as the cap is the most valuable asset for Vancouver next year.
Brock Boeser - Brock has 2.5 Years left at a 6.5m Cap hit. His Season has been up and down but his Points are there, I don't see the Canucks Retaining anything if they trade him, and a 2nd Round pick should be enough to move him. Again, Canucks getting "cap" As the trade asset.
Luke Schenn - Absolutely Awesome year for him, our 2nd best Defender all year, Amazing Career turn around, I think a 2nd Rounder would be a nice get for him, or a 3rd + 4th if they want quantity, But imo I would look for the Canucks to keep him even past his contract.
Kuzmenko - He is a tough one to Guage his Value, I feel like a 1st would be nice, but as a UFA, I doubt it. Maybe try to get Multiple 2nds or a 2nd + 3rd if they Don't keep him and sign him before the deadline.
That's basically what I am thinking for all of those.