To be fair, you really do not need to use sprint in this game. I only really use it as a BLM so I can dodge something and get into position to dps sooner. As a healer, I never really needed to use in combat and I have done endgame raids. The only time I can think of is during A7s during healer fire and merry go round and sparks go out.
Also it's not unlike they won't have a way to get TP back. Maybe make a stance for them that when activated transfer a percentage of one resource pool to another and vice versa.
Like say DNC has two dance stances thavnairian and an ( ala mhigo combat ritual dance maybe 'CRD'?). You start off in the thavnairian dance (TD) which is your healer/support skills and is completely mp based, but when you switch to your CRD, a portion of your mp is converted to tp. When you switch back to the TD, a portion of tp is converted to mp.
This would also eliminate the need for Cleric Stance for DNC