Set Conversion Exit for dropdown values on INT4 field in SALV

Currently I set the dropdowns of an INT4 id field as follows:

TYPES: BEGIN OF dropdown_column_ty,
         columnname_handle TYPE lvc_fname,
         columnname        TYPE lvc_fname,
         conv_exit         TYPE lvc_edtmsk,
       END OF dropdown_column_ty,
       dropdown_column_tt TYPE STANDARD TABLE OF ty_dropdown_column WITH EMPTY KEY.

DATA: i_dropdown_values  TYPE salv_t_value, " to be filled by external values
      i_dropdown_columns TYPE dropdown_column_tt,
      salv TYPE REF TO cl_salv_table.

< Stuff to initialize variables here >

LOOP AT i_dropdown_columns ASSIGNING FIELD-SYMBOL(<dropdown_columns>).
  salv->get_columns( )->set_dropdown_entry_column( <dropdown_columns>-columnname_handle ).
  FINAL(column) = CAST cl_salv_column_table( salv->get_columns( )->get_column( <dropdown_columns>-columnname ) ).
  column->set_cell_type( if_salv_c_cell_type=>dropdown ).
  column->set_dropdown_entry( 1 ).
  column->set_edit_mask( <dropdown_columns>-conv_exit ).
ENDLOOP.

salv->get_functional_settings( )->get_dropdowns( )->add_dropdown( handle   = 1
                                                                  t_values = i_dropdown_values ).

And I get the dropdown values like this:

 METHOD get_dropdown_values.
   DATA dd07 TYPE STANDARD TABLE OF dd07v WITH NON-UNIQUE DEFAULT KEY.
 
   CALL FUNCTION 'DDIF_DOMA_GET' EXPORTING  name          = 'DOMAIN_NAME'
                                            langu         = sy-langu
                                 TABLES     dd07v_tab     = dd07
                                 EXCEPTIONS illegal_input = 1
                                            OTHERS        = 2.
   LOOP AT dd07 ASSIGNING FIELD-SYMBOL(<dd07>).
     APPEND <dd07>-domvalue_l TO r_values.
   ENDLOOP.
 ENDMETHOD.

And that works for the Column itself like it should:

But the dropdown values still have their id in it:

Given it's an editable SALV on that column, the user must choose the id in the INT4 values, which enters the id in the field. If he presses the enter key afterwards, the conversion exit gets applied (which converts the id value to text, e.g. 0 into offen). Plus, he can look at the F4 for the corresponding number.

But is there any way, I can apply the Conversion exit to the dropdown values itself too? Because if I replace the values with the text instead of the id, it will show them, but they won't be editable anymore, because there would be text instead of numbers in it, which the SALV's automatic check wouldn't allow... The current solution is a bit ugly like this, but I can't find a way.

System: ABAP 7.58

I just found the Solution by accident. I removed the explicit setting of the conversion exit:

cl_salv_column_table( r_salv-salv->get_columns( )->get_column( <dropdown_columns>-columnname ) )->set_edit_mask( <dropdown_columns>-conv_exit )

and instead, added it to the Domain itself. Then i changed the dropdown values from domvalue_l to ddtext to show the text. Now the automatic check accepts it and the texts are shown as wanted, but still uses the ID internally: