You are highly unlikely to ever have a problem, but in a pedantic technical sense there is a lot wrong here.OK, so these are the stickers I've settled on. I will be printing them on glossy photo paper and fixing them with helicopter tape.
This is for the frame:
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This is for the motor:
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What do you think?
1. Your motor is not marked by the manufacturer as 250W, and so technically is not compliant.
2. Your DIY labels are purporting to be by the manufacturer and so are misleading. Lawyers might be harsher than my words here.
3. MXUS did not make your bike and should not be shown as it's manufacturer on the label on the bike frame. You are probably the 'manufacturer' as the person doing the conversion.
4. The bike label overlays the manufacturer's decals, and so is very obviously not applied by them. More likely to encourage a closer look than to prevent it.
I think you would be better off with honest DIY labels containing accurate information and no misrepresentation, plus carrying the receipt for the motor from the supplier that shows they supplied it as a 250W motor, information on which you are probably entitled to 'rely' in the legal sense of that word.
Conversions are tolerated despite being technically at least a grey area: I don't think you are in any worse a position with the above than any other conversion.