Any fabrication Shop can easily do that.
Cut your tongue off at the desired length, weld on plates to the 2 sides needed, make an insert, then weld it together, is how i would do it. Some people would probably just weld on the 2 plates and butt weld it without an insert, especially considering the minimal weight of it.
I tend to over build everything, so would do an insert as well. Very easy job, wouldn't take long. Hopefully you can do the rewiring yourself. Done my own, and done two more for friends.
Just call around to a few fab shops, don't overthink this.