The N/A manual transmission is so brittle and weak the trans will break before you get out of first and that's a manual. Automatic N/A trannies on FC's are worse. They won't even hold the stock HP the T2 S4 puts out though all gears, let alone an S5 (because you would have to use an S5 13BT). So you could do the swap and never drive the car unless you want to replace your tranny every 10 miles.
If you went with the 20B transmission, you would need a custom driveshaft, halfshafts, and 20b rearend. And good luck finding those, lol. If you do! Hope you have the cash, just all that will run you around 10k, not including your T2 engine price or installing any of the parts.
Also Jspec rotaries are a gamble. I have heard MANY horror stories about purchasing them. Go to RX7Club.com and search for jspec. You will want to throw up at what kinda of condition these motors are in when they are shipped to the buyer.
In my opinion you have 3 options..
1. learn clutch.
2. save for your whole life and do a 20B swap. Around 40k or so for a half ass swap.
3. rebuild and port your N/A. You can't go over Extended streetport though because a bridgeport and up needs a TurboII Transmission to handle the power. (Bport puts out around 230-280 on a S5 N/A.)
Halfbaked- The TurboII engine (the 13BT not the 13B) never came in automatic. Not even in japan.
Sorry to disappoint.
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