Gatorade is yellow-green, you heathen. Anything other than lemon-lime Gatorade require the qualifier.

Knit fabrics are your best bet, e.g. old pantyhose/tights, old t-shirts, etc that are securely tied to the trellis. Flexible and wont dig into the fruit, but will support a decent amount of weight. Many forms of stretchy-net-knit fabric will work out.

You can harvest obvious cucumbers (tube shaped fruits) fairly young if you notice them, let the others go until fully ripe late summer/fall. Honey nut squash can also be used as summer squash, fwiw, if you identify them and harvest them early (they tend to bulb at the bottom long before ripening).

Since honey nut squash, pumpkins and cucumbers are actually members of separate species within a genus, there’s relatively low chance of them crossing (unless some close neighbors grew other varieties of one of those species), so if you have random clues from previous batches, there’s a good chance they’ll hold for newer ones.

Oh, that’s fair. I just vaguely assumed they were called bat flies because someone once upon a time thought they looked kinda like the fly version of some sorts of bats, but obviously didn’t bother looking into that.

Why would bat flies have no wings? Bats famously have wings!

Option 1) The honey nut squash vine itself will have a slightly prickly stem, the pumpkin will have a softer hairy-prickly vine skin and the cucumber will have relatively smooth vines (or the most prickly, depending on species of cucumber).

Option 2) Trellis all of it and if you notice any growing into a pumpkin shape, add a sling support tied to the trellis to hold the weight of the fruit.

Option 3) Just let them all ramble around and harvest what seems to be working out.