Well... by the "request" lines...
Patric Hornqvist is a good multi-cat player who has scored 22-25-22-21g in the last 4 years... that's close to a 25g pace.
NHL-ready prospect: I would try to offer Josh Anderson, who I don't think can repeat his good year.
Goalie prospect: I'd go with Ukko-Pekka, try to offer him up on the thought potential that BUF is going to be really, really good in 3-4 years (which they WILL be... but its a huge wildcard whether UPL will be the guy come that time)
Be prepared though, he'll probably want somebody younger for the "25g scorer" - so that may require Kreider.
Hornqvist/J.Anderson/UPL
Give that a try.
But be advised you'll likely have to increase to:
Kreider/J.Anderson/UPL
And if that can't get it done... then
Kreider/(Wing Prospect)/UPL
You could also try to offer Boone Jenner... who, two years ago, would've probably got the job done.
I'm a big Boone fan - because of his hard-nosed play and strong jaw-line - but he really doesn't have dynamic scoring skill.
Last season (18g,16a) was pretty disappointment - but more reflective of his actual talent level - he got stripped from 14ppp to 1ppp.
If Pastrnak-owner owned any CBJs in 15/16, you could offer Jenner, but if he pays attention to stats, you won't be able to sell Boone.