hmmmm, strange restriction... it's as if you're trying to discourage people from focusing too much on their twink, who think low level character is a main

if that's the goal, i think you're doing in the wrong way, and will only angered these people. before doing this, better to fix the core problem that cause this twink as main phenomena, which, for me, the cause is the equal effort needed when making an alts, lacking integration between characters in the same account (the only thing shared between characters are stash)