Vexillology

Is there a reason for the Maltese cross to be white surrounded by a red rectangle? It might be better for it to be replaced by a red Maltese cross of the same size, perhaps in the same location of the George cross in the present flag.

EDIT: I imagine it'd look something like this

🇲🇹

Considering only three institutions have received the George cross, being Malta, the Royal Ulster Constabulary and the UK's National Health service, shouldn't it be displayed more proudly? 😂