dcb: one project at a time!
Also, the ForkenSwift doesn't really have enough power to use just 2 gears.
ZeroFuel: yes, one shaft would have to be sacrificed by cutting the gear off, then modifying it fit the splined end of the shaft where 5th lives. So you definitely need a "spare" transmission to do this.
(PS: you should
fill out your garage info so we know what project vehicle you're working on.)
The
Ford ZX2 custom 5th gear thread mentioned above used a sacrificial shaft as the source of his small 2nd gear cog as well.