I've found that Precision Fabrics Code 60001 polyester peel ply to be pretty easy for removal. If the bond lines are super critical they also offer some non-silicone based "Super Release" products. I use Airtechs porous release ease TFP and nylon supelease blue (SRB) peel plies for surface finish only. The SRB is coated with silicone and will transfer. No issue with painting, but I'd never attempt to use it for bonding without an expectation for failure.

Aside from using peel ply, mechanical preparation is the only other way I know of. Of our suppliers uses a grit blasting process for preparation, but it requires thorough rinsing and drying before bonding can occur. It is somewhat inconsistent and messy.

The strips method works too, but the best thing you can do is pull up as perpendicular to the surface as possible, otherwise the support will tear, and then you know the rest...