If I had to Surface grind end-mills I would set a spin index on the chuck at 5 to 10*off 90* depending if the end mill was to be a plunge cutting on conventional cutter in the direction to give clearance (but end to the right), set perhaps a .030 shim under the away/far end of the spin index base so giving some dish, set my tooth to be ground in a vertical position, set some block -ins ahead of the spin index so it would not go flying, lock the table position so the arc of a dished wheel would arc near the cutter across center. Use a mirror to be able to se the end of the cutter, then grind with the same method as would be used on a TC grinder. The secondary I would put on by hand on a bench grinder dressed to about 20* andle.
To get the flutes to the same height I would first V block hold the end mill and flat grind the end, then with the spin index grind watch to see the flat land just be ground away.
Common to worry about side wheel grinding so I try to use a 3/4 wide and use it down to 1/2 so having greater strength/ one could flip up the wheel guard face and use a cut wheel.