...
How exactly are you going to spot me? I approach take off with about 4 kanga hops..... I personally would find a spotter very off putting
for me personaly I would be on a spotting block and have you bound your prefered number of times back to me then I would hand spot you from the side from take off to landing. spot would be at the hips. Old hat stuff except that Im standing on spotting blocks beside you (paded table so to speak, also beside you) Its no different than I would spot someone tumbling into the back flip where the only spot needed is the back flip except I would be on a block.
Then again not on a spotting block could have its spotting benefits too. Then it would be like spotting someone on a dismount off High Bar or Rings where they are still well above your head and your just making sure they rotate the last bit to their feet with a little pop on their back or hips on decent;...... if they need it. Or a complete catch and set them on their feet if they balk out and are on the way to their head. Then from experience the the spotter knows to get under them and heave the hips over or stop the shoulders in their downward dive and let the rotation finish (roll off spotters hands). Then grab thigh and calf for stilters, hips for tumblers, and set them in to a landing on their feet/hoofs.
It's real hard to describe. It's just an eye a spotter has from experience and having the hands and mind ready for several possibilities of might might go wrong.
but still; I really do get what you say... if your not from the background of having someone there... I can see that adding a spotter would be like adding a forien element into your space and since your sorta unsure of where that element is in your space.... that could be freaky. Still it is safer though. You just got to get use to it. Drills could be designed for that as well.
If you want a spotter for safety... you just got to let yourself get use to it.
With the towel thing.... I would make a belt out of towel and put a rope on spotter side connected at hip of jumper. As you bound backward I would feed the rope thru my hands backward till you get to me. Standing on spotting block I would then have my grasp right at your hip on take off. Thats right where you want it. (center of rotation)