There is no such a way to use an old Conquer exe to run a program like you have, the .exe file is changed almost every time and contains things that maybe the old client.exe didn't so in this way you will find yourself or not able to log int to the server or be able but end on botjail/restrict
The one of the ways should be to moddify the both of them Conquer exe and the script vessel which should end on a working project but there is the next problem, there is no such undetectable hooking method which is public cause TQ patch it all time so if you try to hook/debug the client will get you banned or restricted

Have fun.
PS# I was thinking about something like a proxy ( Hooking the data flow of the conquer client and manipulating it but there is no such a way w/out trying to debug it)