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afaik to get another pair matching you'll need to order a both locks together as a complete replacement (i don't think they make locks based off an existing key but you can ask). to get the battery mount lock you may have trouble finding that anywhere except from a dealer, so therefore you'll have to order the wheel lock from them as well. haven't had to source any parts or order for over a year so things change. cheap option would be to buy any wheel lock that fits and mount that, and live with 2 different keys
in terms of replacing them you can almost certainly do it yourself. on the UA its a 10/15-minute job assuming nothing goes wrong. I don't know what bike shop pricing is like these days but possible what FC wants is standard for this work - also I've never done on a tern so i don't know how long it'll take.
Kinda true, the key serials are nothing to do with the battery or drive unit, you’re relying on someone manually punching them in before sale to be accessible from the diagnostic. They’re also sometimes available from the receipt / invoice too. (Just pointing out so people don’t get complacent, always write down ur own key codes!). Replacement keys will be ordered through Abus too
If not there you need to buy a new battery lock (and a new Dutch lock if you want your keys to be matching still)