Citroen Relay / Peugeot Boxer (Fiat Ducato?) 02/03 Remote Locking Unit

First off - I'm in the UK, in case the vehicles are differently specced elsewhere.
Thought I'd ask here, as the Fiat Ducato is basically the same van, and I've
also been informed that the remote locking system is more a Fiat design than Peugeot/Citroen, so any help would be much appreciated.
I've recently bought a 52-plate (October 2002) Citroen Relay 2.2HDi LWB High Roof van to replace my slightly newer 53-plate Peugeot Boxer 2.2HDi MWB Low Roof van, and if possible, would like to transfer some features over from the Boxer to the Relay.
First off - the Boxer has a CD player, which I would like to swap with the Radio/Cassette in the Relay - they're both standard fit items, and neither have any form of steering wheel controls - am I right in thinking this should be a fairly straightforward swap?
Secondly (and rather more complex), the Relay has central locking (operational from the cab doors only), but not remote central locking. The Boxer has remote central locking, and also an alarm that is wired in to the central locking, with a separate key fob. Would it be possible to move the remote receiver/control unit from the Boxer to the Relay fairly simply?
A few thoughts/questions:
Am I right in thinking that the alarm in the Boxer would be directly connected to the central locking system directly, and not via the remote unit, therefore enabling me to remove the factory remote locking unit from the Boxer, and still have remote locking via the alarm key fob?
Both vans have a switchblade style key, with an immobiliser chip built in. Obviously if I was to transfer the remote locking from the Boxer to the Relay I'd have to use the original key unit from the Boxer, as that's got the lock/unlock buttons on it - but obviously the immobiliser chip would be wrong - is the immobiliser code on a separate chip to the one that controls the remote locking device, therefore making it a simple case of swapping the chips over, or would it involve having to get all chips reprogrammed?
Lastly, is this realistic to do the job myself, and just take the keys to a dealer/specialist with the right equipment to get the keys reprogrammed, or will it save much more hassle in the long run just getting an auto electrician in to do the whole lot, and if so, roughly how much would it cost?
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AstraVanMan wrote:

motorcaravans have upmarket facilities like this and most motorcaravans are Fiat/Peugeot based.
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