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I don't know if they are the same any more, but for the earlier V7's the ILCO X270 TMC1 was the one - no on-board electronics & comes as a flat.
Check a owners manual. I think they are essentially electronic, not sure any old key will work?
The owners manual says they are.
I stand corrected. I assumed the v7III would have essentially the same system as the v9, but that is not apparently the case. I see nothing in the v7 manual to suggest the ignition key is anything other than a good old school key.
FWIW, I've found locksmiths to have a bigger range (& often better skills) than hardware stores, but that may be country specific.