Um... maybe just me. But re setting a 55 Gallon is not that much work to me..?
It's your choice to make. I'd take the advice Gmaquarium gave.
Buy another 55 gal. either NEW or used in perfect condition.
Get some rubber made totes (borrow some if you can and don't want to buy),
then get a water container (rubber made or other) big enough to hold at least 30-55 gallons of water.
Put rock, corals (what ever you have) in the various containers all in your tank water. You should be able to save all the water.
Set the new empty tank on your stand and refill with everything.
Done. With No hassle trying to make a new brace or purchase one from the manufacturer.
With all the right equipment, I could get it done in less than an hour.
I will say, drilling is a good idea. You can make a much better set up if you do that to the new tank. I wouldn't bother salvaging the old tank though. But that's me. Not worth the expense or effort in placing a new plastic trim/brace. Drilling on an intact 55 is worth it though.(in comparison)