Hayton would be unnecessary as we already have better centers and don't have a use for him

Foerster is the only one in that Philly trade I'd want and I don't see them moving him anytime soon and if they did they'd get better offers

I expect Habs will not trade Primeau given all they went through this year to ensure they didn't lose him on waivers. He will have a chance to prove himself as a backup the next two years until Fowler comes from Boston College (likely to the AHL in 2025-26). Cannot see Philly looking to move Foerster where they are in a rebuild and he has been promising.

Flyers aren't trading Foerster

What would it take to get Rasmus Ristolainen? (I personally think Rasmus on the Right and Kaiden Guile on the left. Would be a very solid pairing. I think Michael Matheson is expendable due to irresponsible defensive plays)
Do Flyers fans think Josh Anderson can revive his career in Philadelphia under Torts, where Anderson had his most success to begin with.

If you're proposing we move Matheson and Guhle is on the top pairing, then a partner for Guhle needs to be capable of 20+ minutes a game. That's not Ristolainen.
I don't disagree with the concept, only the target.

Anderson needs to play North-South and will probably be better in a trap system. Even if we find a fit for him, don't expect much of a return.
Nobody believes he can turn his performance around. It's up to him to make whatever adjustments he can before next season and prove he can still be effective and produce.
There's hope, as his shot volume is a little low and his percentage dropped significantly this season.
He needs to prove himself and hit a new level to at least be useful to us for the remainder of his contract.

Which 3 players are most optimal for the Habs to target at this moment in time? Who are RHD to pair with Guile then?

Right now we need to wait for the development of Reinbacher, Mailloux, and Barron. If the team is ready before they are, it's UFA. (Montour and Pesce this year for example, but we aren't ready for the UFA market yet.)