I am forever looking for the right stem/handlebar combination. When I think I find the right stem length or HB shape, I start wondering if there is a better configuration. More time with a given configuration often exposes the little details that aren't quite right.
This gets a bit complicated when I add various brake levers from Campagnolo NR non aero to aero to gen 1 Ergo to gen 2 Ergo and their position on the bar.
The constraints are mostly Cinelli parts, and I have a variety.
The issue is, as the title implies, what do you use for temporary bar tape. Reusing the final tape is problematic as you can appreciate the challenges associated with change in color and shape, not to mention matching the number of wraps.

I would like something that isn't a waste of money and can serve as a temporary wrap that might be used for several hundred miles, just to be able to assess the new configuration.

Pipe insulation is not an option!