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Try it in a pool and then see if you change your mind. I have tried it while diving SM and it can be done but I would not plan on doing it when a cheap reg could be added so easily.
No reason to go cheap, but inexpensive is good. An old Mk2, Mk200, or Mk3 with a High Performance 2nd (an R190 will do if you don't mind plastic) can be had for under $50. New seats and o-rings can be had for under $20 if you can do the work yourself.