Thing is, everyone is different in their comfort. I can't carry AIWB, it isn't that I'm uncomfortable pointing at my junk, it's just the way my body is and the way my pants are comfortable, the gun digs into me at both muzzle and grip, depending on how I'm positioned. I usually go 4:00, but lately I've just been wearing a shoulder rig and a flannel shirt. I'm big enough that the holster disappears under my arm and you'd never know I was armed, likewise on my hip, my shoulders are big enough to allow my shirts to drape and conceal - I don't wear fitted dress shirts, though.
My son, 12 years old and 5'4", 120 pounds doesn't understand why I don't wear it AIWB. I told him to try wearing it all day and report back, so he strapped up the Glock 21 AIWB (unloaded) and wore it around the house all day - no issues. Concealment was perfect in a simple T shirt and jeans. When he tried a shoulder rig, it was uncomfortable and made his upper body look and feel awkward, and wearing at 4:00 for him prints a huge bulge on one side because he's so small.
If you wear cowboy boots, you can clip an IWB holster into the left inside boot while you're working. Slow draw, but you'll be armed - I don't know your circumstances to know if you need a speedy presentation, or just the ability to return fire eventually. After your shift, you can switch it from boot to belt for better access on the way to the car.