IMEオフに出来ない環境で自動入力された16進文字列の変換

def restore_hex(ime_text):
    replace_map = {
        "あ": "a", "え": "e",
        "ば": "ba", "だ": "da", "ふぁ": "fa",
        "べ": "be", "で": "de", "ふぇ": "fe"
    }
    
    zenkaku_to_hankaku = str.maketrans(
        "０１２３４５６７８９ａｂｃｄｅｆＡＢＣＤＥＦ",
        "0123456789abcdefABCDEF"
    )

    result = ""
    i = 0
    while i < len(ime_text):
        if i < len(ime_text) - 1 and ime_text[i:i+2] in replace_map:
            result += replace_map[ime_text[i:i+2]]
            i += 2
        elif ime_text[i] in replace_map:
            result += replace_map[ime_text[i]]
            i += 1
        else:
            result += ime_text[i].translate(zenkaku_to_hankaku)
            i += 1

    return result

s = restore_hex(s)
val = int(s, 16)