What dough recipes are suitable for "shaping" with a piping bag?

I can't answer the question about piping so much (but see my comment about recipes meant for cookie presses), but I think I can help you with your problem.

Depending on how firm the dough is, you might be able to reduce the time that it takes to shape the balls, and thus increase the number of balls that you can shape before the dough gets to be sticky:

First, I would chill the dough in logs, rather than just the whole bowl. Place it over waxed paper or plastic wrap in a bit of a line, then roll the paper (or wrap) around the dough. You can sometimes tighten it up the log by folding the wrap in half, then pushing on the log with the edge of a sheet pan or cutting board before you roll it up.

Then, you can take a single log out of the fridge, unwrap it, and cut it into bits, and then roll each one. For more problematic dough, you can cut up half of the log, and then return the uncut half to the fridge while you shape the others. I've even cut up a log (using a table knife, so I didn't cut through the paper/wrap), then put the whole thing back in the fridge to cool back down.

As moscafj has mentioned, gloves might help. But because the dough might not stick to them as well, but they'll also insulate your hands so the warmth doesn't affect the dough. You can also try rolling the balls in your fingers, rather than the palms of your hands, as your palms are warmer. Depending on how sticky the dough is, you can sometimes roll balls out on the counter or cutting board, using just one hand, which might also help reduce how much you warm them.