I'm sure your method works but waiting overnight and/or using a vise to aid bonding sounds unwieldy as well as unnecessary.

I must have patched hundreds of tubes while living and cycling in Philadelphia with streets littered with broken glass. I never had a patch fail and I've never waited any time at all for the patch to bond, other than the time it took to reinstall the patched tube with the tire on the wheel, pump it up and be on my way.