He wouldn't be ideal, but for the sake of conversation would Markstrom be an option? Calgary might regret signing him to that deal if they're going to rebuild so he might be pretty cheap to acquire. May as well just sign Grubauer to 6x6 though if we're gonna go that high in AAV, though Markstrom would effectively be 6x5 instead of 6x6.
My initial thought would be Grubs, but Markstrom has a track record of being a starter with a heavy workload. It's a hard choice, i'd probably just sign Grubs unless we could convince Calgary to retain 500k.