I was doing a dungeon a while ago and I sort of did this combo. I had a Warrior topped up, threw in Divine Seal with Regen, and then used those skills. I wasn't really thinking when I did it, but I realised that I could DPS the enemy for much, much longer.
Since Swiftcast has a CD of 60s, you obviously can't use Stoneskin ala Adloquium as much as you'd wish. It should go without saying that this destroys your options for an insta-Raise as well (or insta-Medicas should those situations ever arise).
On the other hand, if you're good enough, I doubt you'd have much difficulty distinguishing when's the right moment to use it. It could be a useful strategy for situations when you just know the tank's going to take a lot of damage. Since the usefulness of it depends on timing, I'd wager that a lot of practice is required for this to be viable.