Messed around with how fitting Rantanen would look like and while I still thing they'd be better served using the cap space to add depth throughout the roster it could be done assuming you can convince him to sign like 8x11?
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This would be running a 20 man roster though, which seems unlikely so more realistically you'd probably replace Dowd with a plug or the corpse of Glendenning and then keep Gage or something.
I think a part of this that hasn't been talked about though is how bad it would look on Canes management if they went all in on a Star player only to lose them to Tampa 2 years straight, so among the many reasons why I think this wouldn't make a ton of sense for Tampa I also think Canes would want to avoid this outcome.