I was aware that I can overload internal DB:: functions, (sorry for not mentioning)

I just had the hope that I could solve this with an *option* (CLI or .perldb).

Actually in this case I think I have to overload DB::sub like demonstrated in perldebguts

      {
        package DB;
        sub DB  {}
        sub sub {print ++$i, " $sub\n"; &$sub}
      }
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