Model 12 grader, stuck clutch

22 miles is a long way to hold down a clutch pedal! If you were not holding it down, the clutch was not supposed to come loose.

If you have the room, I would put it to work in the highest gear possible.

I recently dealt with this, but in a dry clutch farm tractor. I could actually start it up in gear (after defeating the neutral safety switch). So I was able to work it pulling the plow that was conveniently already hooked to the back of it. Took a whie, but it finally came loose with a bang.

Your grader already has the blade on it. Just need the place to work it where you can turn at the end of the run to go back the other way.

Or if you cannot do that. How about chaining something heavy like a tractor or wheel loader with good brakes to the back of it, have someone driving the towed machine push start the grader in high gear and then put on the brakes.

Sorry, i didnt elaborate on that, i drove it 22 miles, but only pushed the clutch in every once and awhile, i have 2 old hay stackers, can hook up to one of those,
my uncle just bought a F20 farmall with a stuck motor, he put diesel fuel in the cylinders, 6 days later i hand cranked it a covered him in diesel, i didnt think it was freed up already, wondering that when i change the oil i should try diesel fuel in the bell housing and put a board to hold the clutch open?
i got a manuel yesterday, says the interlock is pulled up by the fork cross shaft, the lever moves even though the clutch is stuck, so it should be moving the interlock
Another thing i thought of is that if the clutch is out of adjustment, its pushing in on the 3 fingers, it may be pulling them back, just not far enough to put any space between the discs.
im going to put on a 12 volt gear reduction starter off my old 3406B, then i can start and stop if need to shift gears until it breaks free, it has the hole in the flywheel housing for the starter, looked for it before i bought it
the guy i bought it from said it was stuck when he bought it, it freed up driving it home for him, then later got stuck again

Be aware that the 8T (D31😎 does not use a straight tooth gear starter drive.

thats right, you had said it takes a helical cut gear, damn

do i need a right or left helical drive for the 8tc?
i found a nose cone Bay item number:
351075809949
the name looks fermiliar to the amoc site triodiode,

No, 4 stroke all the way.

Oil dipstick and fill port are on opposite side of engine from controls. Drain is a plug in the clutch housing below the pony mounting base on the same side as the dipstick. This is near the main engine dipstick on the rear face of the clutch housing. Pony holds about 1.5 quarts of oil.

Takes a right hand helical starter drive.
Correct drive end housing depends on the starter and it's lever housing. Need a picture of the lever housing with drive end housing removed to get it right. Starter choices are 40MT, 42MT, 50MT clockwise rotation only.
It's an 8T model grader, not 8tc.