Sounds like you Investigated the needs of the bikes and yourselves well. Hopefully some of the walking gear will be suitable for use on the bikes.
Computer and it is down to you to decide what you want out of it BUT on the lock---Do not go cheap. There are various grades of lock and there are ones that are classed as high security. I use a Kryptonite and also have a 10ft hawser so that I can lock the bike- wheels and saddle to an immovable object. That immovable object may even be the car when transporting the bikes aswell.
Only thing you will need now is time on the saddle-and that may be difficult to do day after day till the Butt and saddle get orientated.
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How long was I in the army? Five foot seven.
Spike Milligan