The truth is protestants are trying to hand their hat on the same nail as the very people that rejected the entire New Testament. Do you really want to use the OT only?
The so-called Deuterocanon or second canon or Apocrypha came to be known as such for a reason, verga, and that reason was that their canonicity had always been disputed, disputed in fact within the Roman Catholic Church right up to the Council of Trent.