Hello Switch-
The first question is a hoot. Don't have an answer for you. But if you keep your hair at 4 inches you should be ok.
Don't know much about Dr A however his prices are keen. If you are a diffuse thinner then 1500 may cause more damage than help. 15 % + may never grow and shockloss may become a factor for you also so at the end of the day net loss could be a reality. A diffuse thinner should be looking at a minimum 4 k+ grafts.
Had I been a diffuse thinner I'd still focus on building a decent hairline. The guys that go bald in the front are almost at an advantage because they know this. Diffuse thinning must be really tough mind wise.
With regard to haircut I'd imagine a diffuse thinner would look much better with a buzz cut instead of longer. It may be a look you enjoy, especially if your skin is tan.
With regard to returning to work, if you can wear a hat, then the answer is 7 days if the swelling is a factor, otherwise once the post procedure care ends.