Have you tried any of the login window mods like:
http://www.eq2interface.com/download...ginEditor.html
http://www.eq2interface.com/download...character.html
Also, I know Profit has a login window that lets you switch to different accounts easily. I think you would just need these files:
eq2ui_loginscene.xml
_ProfitUI_Loginscene_RowTemplate.xml
_ProfitUI_LoginData.txt