Its main purpose would be shopping I think. I’m hesitant to transport my laptop on a rack because of the bumps and vibrations so I will probably continue commuting with a backpack.
Which means the bag wouldn’t be permanently attached to the bike, but rather brought into shops and removed at home. At which point I can either go for some fidlock silliness which would be a lot of fun but wouldn’t really translate into a marketable product or go for probably the most used platform and strap a Wald 137 to it.
I commuted with a laptop in a neoprene sleeve, in a BigXTop front rack bag for a couple years alright, I assume the sieve did a lot of dampening. It attached down with 2 clip straps on the bottom - the wizard works way of a strap on each side going down through the rack and clipping (and cinching) up on the side of the bag looks like it would be much easier though . I wouldn’t think fidlock would be enough to feel safe, esp with shopping? I’d want a proper clip?
Specialized pizza rack is quite popular platform to work from.
One that folds down flat with a strap to keep it tied down flat that you can pop up and open out when you have stuff to carry?