Best Motoring VTEC Club video has a whole segment about people doing the auto-to-manual swap. Apparently it is a popular mod in Japan. But Larry is right, it will take a lot of $ to do. The most popular swap according to Best Motoring is to swap in the 2nd Gen NSX-R 6-speed. You will need:
6-Speed Transmission
NSX-R Input Shaft
4.23 Ring and Pinion
MT Camshafts
MT ECU
91-96 Clutch Kit
Clutch Master Cylinder
Clutch Slave Cylinder
Clutch lines
Clutch pedal & parts
MT Gauge Cluster?
Probably more that I'm missing.
Both Tsuchiya and Hattori commented favorably on the swap after driving a modded auto car (a KSP I think) and the car lapped close to the NSX-R on the Ebisu circuit. But bring your wallet, dude. It's at least ten grand in parts plus labor.

Since you're in PA, LarryB probably could do the swap for you.