What you are looking for is an unregulated valve. Nobody is going to make a regulator with the same output as the input pressure. It defeats the purpose of what a regulator does. If you can't take the guts out of what you have and make it unregulated, get a dive or SCBA valve with the right thread for your bottle. If your bottle has metric threads, take a look at this one. https://www.aliexpress.com/item/4000026760786.html?spm=a2g0s.9042311.0.0.5ef64c4dD2jmIi It doesn't have a gauge but you won't find a new one any cheaper.
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