Hi Dave,
Yes, the Mk2 reciever can be modified to work with the Mk3 reciever giving full IR control from both location.
The modification involves unsoldering a few resistors and fitting a couple of small diodes.
Contact me off list and I will give you details of the modification and also send you the bits you need to upgrade it.
If you dont fee upto doing the mod then ship the unit back to me and I will modify it for you.
Regards
Keith