Impact of losing keys?

I am planning on starting the work on my old MOT failure VVC, its been sat for about 6 months and as the weather is getting better I feel its playtime.



Problem is, I have no idea where the keys are, I have turned the house upside down looking for them but they are nowhere to be found.



Now thankfully when I put the car under the tarp I left it unlocked so I can at least access the cockpit and the battery was also disconnected.



So...I am wondering, what are the implications of replacing things, for example:



Ignition Barrel - can I just replace the barrel chamber or do I have to replace the whole thing? if so how easy is this to do, are there any impacts on the ECU?



Alarm/imobiliser - Can I lock the car by the key and not have to worry about the alarm activating/deactivating, engine not starting?



Alarm fob - On a quick google I understand I can buy a fob of the bay and then take it to be programmed by an Xparts supplier, is there anything else I need to consider?



Boot lock/Petrol cap - How the hell do I replace these without the original keys? How do I access them



Any help or thoughts on this would be greatly appreciated as until I can sort this there is no real point doing anything else.



And I appreciate the security implications of such a post so if you have answers rather than a post a pm would help just as much.



Thanks in advance.

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