The only remote that works is the old Video Terminal ("Mars bar").
If
your source has a SCART, just use a fully connected cable and you're
done. The MX2000 honors the SCART control signal (pin 8) and will switch
to the AV input automatically regardless of what program it was on
before.
Alternatively, switch it to program number 0. I don't have
my MX here so I could try, but I think you unfortunately need the
remote for that.