the simple solution is to say all purchases of a firearm have a waiting period, no exceptions

Yeah, I’ve addressed this. The “interest” that I accepted as “compelling” only applies to first time gun buyers, who don’t have access to other guns during the waiting period.

To meet strict scrutiny, you need to demonstrate both the compelling government interest and the narrow tailoring. If you want me to accept that “no exceptions” is narrowly tailored, you’re going to have to show me a compelling government interest that applies to both current gun owners and first time buyers.

Your arguments don’t seem to demonstrate comprehension of “strict scrutiny”. That is almost certainly going to be applied to this law. If you want to keep this law, your arguments are going to need to meet the strict scrutiny standard.