What about some kind of "translate" command, where you define two strings
Код:
source = "АБЦДЕФГ....."
target = "ABCDEFG...."
And later in code

Код:
call print_string
translate("АБЦД 123")
Sjasm is going to translate string char by char, and does put same symbol if it is not found in translator strings (like for 123 in example)?