There is one, I don't remember the name off the top of my head... Anyways, it has minimal protection around the bottom of the device so that it can slip into the cradle. The covering is extremely thin there, so if you do get that case, just be careful!
I like my cradle quite a bit, but I eventually went with a Piel Frama case because it was a good deal and a great case. This case is GUARANTEED to not fit in the cradle, because of the nice padding all arond the device. Then again, this case isn't anything like an aluminum case... in that with an aluminum case it takes a bit of force and a bit of time to remove your device from the case. With the Piel Frama (which is leather), my device is out of the case within a second or two...
I'm just tossing this out, something to think about, but is it possible for you to simply remove the device from the case when you put it in the cradle? I always do that, and I set my case beside the cradle so that I don't forget it. True, my device could be safer if it could be in the case on the cradle, but then again I don't plan on playing darts near my computer table...
I thought it would become an inconvience to remove the device from the case every time I wanted to use the cradle, but actually it wasn't ever an issue for me, and it turned into a habbit fast.
I just got used to easily placing and removing the device from the case, and sometimes (if I only need my device for lounging in bed), I don't even take the case. Since the case cover flips up, it allows me to either have my device in case so that I can hold the case by the flip cover wrapping around my hand or I can choose to have the device out of case when I actually want to hold it. I actually like how things worked out with this case, and I don't really mind the not being able to cradle sync in case, it turned into a non-issue.
The Sena case might grip a bit tighter than my Piel Frama, but it shouldn't take too long to insert/remove your device. If you think you could put up with it, and especially if you have the Sena case right now (as you kinda implied), try it out for a little bit and see if you like it that way. You might be surprised. If not, then you can always get the alternative case.
Good luck with your case decision!
