[EnIgMa1234]

Guess you could add a field to the user table. Then have an option to select either template one or two. Edit the member.php file and set it to a variable.

Then edit the part that says fetch_template at the bottom with you var

so like replace:
eval('print_output("' . fetch_template(MEMBERINFO) . '");');

with:
eval('print_output("' . fetch_template(" . $userinfo['memberinfo'] . ") . '");');

not tested at all^^ just off the top of my head