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What you originally wanted to do can be done with a Glendale bridge. They’re not cheap, but probably cheaper than the Callaham you were going to use.
I went a different way with mine - the body was drilled with 4 holes for an ashtray bridge, but I initially put a Gotoh 6-saddle modern conversion bridge on it (I can’t remember my reasoning…). I was curious about the vintage style after a while, so I swapped one on and have never wanted to go back.
I like it, but fancied trying a more traditional Tele. I bought a Callaham bridge and then realised that the US Standard bridges have a different screw pattern. So I'm looking to sell it and buy something else. If I don't get any interest then I'll end up shopping for a traditional one anyway.