I’m 99% sure you can use the 26 spline shaft you have and switch to a 26 spline clutch disc. I did a little test a few weeks ago with the same T5 you have. I used an adapter plate and kept the 26 spline shaft. It worked but I only drove around the block because the T5 badly needs a rebuild. It was whining worse than a spoiled teenager.
The Jeep shaft swap will also work. With the adapter plate the Jeep shaft doesn’t need to have the pilot tip trimmed. Since the Jeep shaft is a NWC shaft, you need to switch to a brass synchro for the input shaft instead of the fiber lined WC style synchro. It will mostly depend on how available parts are. The 10 spline clutch kits are very common.
This video will help explain how the Jeep shaft swap works with a WC T5. Watch the whole thing for all the details but skip to the 8:00 minute mark for now to see.
Jeep swap videoPhoto attached is a muncie cast iron bell with a 1994-95 S10 T5 and adapter plate WITH a Jeep shaft swap. The measurements all match up so it will just bolt right up with a 10 spline clutch kit.
