Sorry, you won't be able to transfer straight to TBS. The real question will be if you can get orders to OCS... I would imagine that with OCS selection being as tough as it is right now it would be quite challenging to 1) get selected for an OCC class (there are only 3 per year), and 2) Convince the Navy, who has already dropped a mint to train you to let you resign your commission for a Marine Commission now.
Remember that OCS has a high attrition rate (it was 40 - 50% when I went), and alot of the times this is due to physical reasons. If you fall on a trail and jack your ankle up, you will be done with OCS and sent back to the civilian world, as Marine OCS does not have a medical rehabilitation company, it simply gets rid of everyone who gets hurt. At the same time I would imagine that once you resign your naval commission they won't be eager to let you back, as they have been laying off officers by the boatload lately.