I believe it would be easier to throw tallergear in the rear end than just one in the tranny, The lay shaft and power shaft gears are kinda designed as a complete set so they fit together.

I may be wrong here but normally, to get a higher output in thetop gear one steps up the rear end vers the tranny.

This would also give first gear a better longer launch but not a faster one.

Fot the record, I often skip 5th as well going up. But it sure comes in handy during traffic. Third is great in heavy rubbernecking as you can stay off the brake and the clutch mostly.

roadster with a stick