no let me suggest some things.
Get Jpexs Decompiler and open the client of the server. CTRL-F your way to a file called ObjectProprieties, in this file should be something like isPlayer = "Player" bla bla bla, click on "Player" and click edit p-code, rename that "player" thing to "plwakdkw" (something random, doesn't matter), save p-code, save client. Run the client.
That's kinda it, I don't know anything about dex or whatever.