You would need a Bravo drive, bravo transom assembly with trim rams, bellhousing, engine coupler, bottom mount starter, and inner transom plate. You would need to reglass the transom cutout, get shift cable brackets, steering system needs to be modified. Depending on the exhaust setup, some changes might need to be made there also for the tips/tailpipes to line up.
Upside is you would save about 125lbs or so, and about a foot or so of room in front of the engine. Plus be able to raise the propshaft height which is probably pretty deep with your TRS, by adding shorty lower unit or figuring that in with your rigging process. Also, parts availability is a bonus. Downside, spend alot of time, money, and maybe even a worse ride witht the weight being moved closer to the stern.
Not a exact quote, but i would think between a good used bravo, or even new, plus all the parts to do the job, somewhere around 4-7k in parts?? Used TRS drive, transom assembly, and tranny, worth around 2500 roughly from what i been seeing.