Thinking through it, SJS has a lot of "spare" parts MTL might want. Off the cuff here:
Marleau
Boedker
Wingels
Dillion
Martin
If I'm not mistaken MTL is in the market for a top-4 LHD, a top-6 winger and some grit. The pieces listed above could all be had for the right price. None are what I would consider "critical" to SJS.
The other thing, and this is likely heresy, but Doug Wilson is pretty shrewd about trading assets before they soil. MTL is rumored to be looking for a big-body center, and I think Hertl fits the bill. It would take a hell of return, but with these latent knee issues, it could be considered.
What is SJS looking for? 2nd round picks for one. Something MTL seems to have a glut of. Cap is another thing, unfortunately MTL is pretty close to the ceiling as well. The final piece however, is a big-bodied winger. Radulov, Patches and McCarron would all fit the bill. As someone else mentioned though, it seems unlikely Radulov is moved.
I can see potential here. Who knows if they can make it work though.