Rocksett would work fine. It's a ceramic adhesive that can withstand 2,000 deg F. of temperature which is why many mfg.'s (e.g. SureFire) of silencers and brakes recommend it to secure the devices. Heat is not how the adhesive is de-activated though; use warm water and soak the parts to release the adhesive.
The picatinny rail steel screw threads have only 4 mm of engagement with the aluminum receiver threads......David v. Goliath.
May have a hard time soaking the bulky receiver in warm water for de-installation.