Did you try making the change suggested by @Brownard in this post ? I had never seen that suggestion before, and to me it seemed quite likely that it would solve the problem with the Dell remote.However, the Dell remote I have doesn't work, and that is supposed to be MCE compliant.
I think that the American expression for this situation is: it's a crap shoot.So its difficult to know if it will work, unless someone has allready bought and tried one.
In non-progammable remotes, the remote will always send a specific IR signal for each button on the remote. That cannot be changed. But what MP2 does when it receives that IR signal can be changed. There is a remote-control setup procedure in MP2 that allows you to specify the action that MP2 is to perform for each button. So functions currently assigned to buttons that no longer work could be re-assigned to working buttons that you don't currently use.There doesn't seem to be enough info available about how to setup these remotes with MCE and MP2
In programmable remotes (such as those made by One-for-All), you can program the remote to a particular code set (I think MCE is 1272), and then the buttons send the IR signals for that code set. So the remote is actually sending different IR signals, depending on the code set programmed. The One-for-All web site can be found here. I would suggest looking at the "Essence 4" (which I have), and the "Evolve 4". These can often be found for sale in larger Sainsburys, and (of course) in Currys. Hopefully, they should work with one or other of your two IR receivers, but... it's a crap shoot!
-- from CyberSimian in the UK