Returned to post pics of the three year old damage that has gone untended, to ease your concerns, but I can see there's no rationalizing.
Regardless,
To add:
I've hit two deer (deer are the US' roo equivalent) both a 55mph, both would've done substantial damage to an OE FJC, came out of both unscathed, the angle of the front tube almost pitching them down, keeping from the hood or windshield.
I've been rear ended twice, without even scratching the PC, and not exaggerating, the first leaving this.....
The second damaging more, but they requested I delete pics.
Snatch strapped another FJC after an overnight stay stuck in a sand bottom OK river, literally yanking time, after time, for an hour to get him 100yards to shore, with no issues, not even movement.
Expo One is a top quality product, well engineered, well though out, and well executed. They've been more than reasonable in most every event I've heard of issues, which do happen, as it is the real world.
Sorry you're having issues with reverse sensors, but don't miss the forest for the trees, since it's a minuscule problem, unless going on a 10 point show car.
If this were the blue room, I'd add to stop being a pansy ass, drill it out, and go on about installing, but it's not and you seem hell bent on "new" bumpers merely for the sake of a couple of enlarged holes.
Before hearing "how much it cost" and "it should be perfect", I spent a whole hell of a lot more money on much more critical components from reputable Australian vendors that I spoke with for over a year before ordering, and it is all screwed up, with implications well beyond that of even the cost to blast and recoat a bumper without expecting them to do a damn thing.
Not stated to inflame, but more a reality check that, it's not an issue that warrants anyone losing a great deal of sleep over, nor anyone losing a great deal of money.
Just putting it in perspective.