Cool idea - and if you need to run Xolxo on port 6347:

Copy your xolox.exe and rename the copy to xolox6347.exe.
Hex Edit your xolox6347.exe with your hex editor and overwrite at address 000F180A (CAh) with CBh. Note: this 'solution' may break your ability to send updates or work with Socks or kill your neighbours cat! NO WARRANTY, it works for me.
You can confirm Xolox running on the new port with "netstat -na", you will see a line somewhere with "TCP 0:6347 0:0 LISTENING".

CU, Moak

PS: Bugfix, address corrected from 000F18A0 to 000F180A, thx Seeker