im assuming you have the blaupunkt DVD SatNav unit with the ford DEATC? built in.
from what ive read previously its not a simple swap to downgrade to the separate Climate control panel, apparently it requires a different wiring loom, and also possibly a different heater box
because the thing about that system is, the climate control ECU which is actually bolted to the bottom of the DVD Sat nav unit and not inside if you pull it out, completely integrates with the Blaupunkt sat nav unit.. which is why when you press the climate button the climate control system comes up on the screen and can be set from the touch screen....even if everything is compatible, the connectors i imagine would almost certainly be different.
I dont think the unit itself is too bad, because its a blaupunkt.
But what you could do as previously said is run the speaker outputs to an amp, then upgrade the speakers.