Any chance to move the project to Wordpress?
If so, I can help with the migration.
Advantages (in my opinion):
Modular
Themes
AdminCP (Separate from the page)
UserCP (On a separate page in the front-end)
Plug-ins to enhance ACM functions
RestAPI (integration with GameServer to expose all classes to view inventory, manage inventory, send items, boss list, skill list, clan management (if you have a DKP system or similar) a lot of things can be done with an API that exposes endpoints correctly)
Security (WordPress is not insecure, a bad installation makes it insecure)
Probably the only downside is that, depending on the plugins the person uses or the modifications they make directly to the code (which is not recommended), it opens security vulnerabilities. Aside from that... I think it's a good idea if done well and well maintained; security is also a strong point.
If's not "i want to mantain project as is" it's ok too...
It was just an idea... when I install this ACM to use on my server, contributions in this regard (exposing the gameserver a bit more) will come.