I've just seen the price of the Mk3/Green receivers, so much for such a small device!
So I've got a key which only fits the ignition barrel, and a door lock with no key. What's the sensible way forward? Replace the door lock cylinder with a simple one for emergency use?
This is my thoughts.
Have you ever tried the ignition key in the glove box? (Probably not, we all don’t

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You have never tried the EKA so you don’t know if it’s correct or not?
The fob works so is correct for the BECM to know it. Doesn’t mean EKA is correct though.
There are many combinations to work with now.
So we don’t know what’s original.
I would say, sure others will correct if I am totally wrong.
Go to you local LR dealer with the V5 and ID they should be able to give you the EKA (for its original build state).
If it matches that’s good, init

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If your key fits the glove box then it’s probably the correct key (as built), if it is then somebody has tried to fix the door lock and replaced everything but forgot the barrel is different (they probably were so happy it worked they forgot

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Remember the fob matches the BECM signals required the key blade matches the lock barrels

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Now let’s see what you find with the keys cos my head is fried trying to explain it.
Now I have heard of (never seen) a so called emergency/valet key that came with new cars which is just a metal key.
The simplest way would be a lock set from a breaker and a key blade. But it would be nice to know what has gone on first.
J