I am assuming that you have some text or numbers where you want to replace Bengali numerals ০১২৩৪৫৬৭৮৯ to 0-9. Put that text or number in cell J15 and try this formula in cell K15.

bn_en_numerals.js

/* Original vba script was from https://support.google.com/docs/thread/65089055/sheets-bengali-number?hl=en I just reversed for the reversed result.*/
=arrayformula( 
  concatenate( 
    iferror( 
      vlookup( 
        mid(J15, row(J$1:J), 1), 
        { 
          mid("০১২৩৪৫৬৭৮৯", row(J$1:J), 1),                          
          mid("0123456789", row(J$1:J), 1)
         }, 
        2, 
        false 
      ), 
      mid(J15, row(J$1:J), 1) 
    ) 
  ) 
  
  /* Alternate formula which works for GoogleSheets ad Excel alike*/
  =SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A1,"0","০"),"1","১"),"2","২"),"3","৩"),"4","৪"),"5","৫"),"6","৬"),"7","৭"),"8","৮"),"9","৯")

)