Off course there’s normally no right or wrong and everything depends on somebody’s personal taste, but I can’t see any obvious advantage in a fast attach option for the front bumper.
I really doubt, that further on you’ll decide on a weekly basis, if you’d like to go for a ride with or without the front bumper.
For me personally an E9 without the front bumper looks just incomplete. Even if you like it this way, there are some regular openings in the body, which makes this not even more attractive to me. Not only the slots for the bumper brackets, but also the side holes at the front fenders, where the bumper normally is bolted to.
If you leave the bumper off and decide to follow Gary’s suggestions, how long will it take for somebody to recognize, that this was an US delivery with the big and more than ugly bumpers ?
I don’t have any clue why it is such a challenge to follow the how to do a reasonable conversion to a Euro style bracket for a Euro style bumper ? You (and Gary) even got pictures of that. Just 4 (2 on each side) mounting points, welded at the sides of the engine support beams.
For an experienced sheet metal guy a duty of just 2 hours. No risk to destroy or just scratch fresh paint, while doing the necessary adaption. Even a less effort maybe compared to produce special covers for the big tunnels, that will remain in the front valance, if you follow these suggestions of your shop.
I would like to have it done right, instead of done before May 15th ….