I'm in the same situation, with a 46 bow.
There was a thread arround a while ago where they used acrylic and nylon screws.
Basically they cut the brace out leaving an inch or so on each end, and drill and use nylon bolt/nut to secure the acrylic strip to the tab from the old brace.
I think if/when I get arround to it, I'd also want to put some epoxy inbetween the acrylic and tank frame, but thats just me.
Maybe you can find the original thread if you search for it.
-John