There's no one player on your team that I think would be worth Thomas, who had almost 90 points on a team who had almost no offense aside from him (Kyrou and Buchnevich had down years for them, and Neighbours was a surprise, but I expect him to be a middle-six player, and he was played as a top line player because we had nobody else). I mean absolutely no offense to the Habs when I say this; it's just that Thomas is by far our best all-around player on an absolute steal of a contract.
The Blues entirely lack center depth behind him at the moment; Dvorsky is talented (reminds me of Kopitar-lite - stylistically, not at all saying he's going to be Kopitar, but his style of play reminds me of him), but he's still a ways away. Dean is also talented, but still very young and learning the NHL game, and he's probably a third-line center for us. We were playing Kevin Hayes and Brayden Schenn as our number two centers. If we traded Thomas, not only would we be trading our best player, but our only current top-six center option. It would crater our center depth and offense.
So for those reasons, I'd decline a Thomas trade for any one or two assets.
Kyrou is more interesting but given that we lack game-breaking wingers as it is (I'm pretty sure we're going to trade Buchnevich for a late first in this year's draft. Neighbours impressed, but he still would be a middle-six winger on a better team, Snuggerud will play another year at Minnesota, Stenberg will play another year or two in Sweden, and Bolduc is still very young.), I'd also have to decline a Kyrou trade. It would be tough to give up a chance at the #5 pick and a game-breaking defenseman, but I don't think Montreal would do that for Kyrou, and without Kyrou - and likely Buchnevich - our scoring depth dries up completely.
So, for those reasons, I'd have to politely decline both Thomas and Kyrou trades. I think Kyrou is well-thought; it's very tempting, but I still want to roll the dice and hope his offense regains its old heights while still improving on defense like he did this year.