Hi Max,
I had this issue 6 weeks ago! Flexis were blown to #@?!
I got powerflex lower engine mount done at the same time too, as they will have to drop the subframe anyway. It reduces engine rocking quite a bit so will stop it happening again any time soon. You will have increased vibrations after though, but this will dull down after a few hundred miles or so.
Don't worry about driving it with blown flexis, I was a bit slow on the uptake and left it almost 6 months (driven daily!) A bit less mpg but everything else fine.