When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
also, worry about the hub bore, you might need to use a hub ring with it, although depending on the design of the wheel, that might not even work. If the hub bore is too big, it will wobble. I suppose this isn't the biggest deal, considering it would be for temporary use anyways, but you'd really need to watch your speed to be safe.
1mm is enough to call it not concentric (1mm off is significant). However, if you drive carefully and slowly, and don't drive a long ways on the spare (you should do all these things anyways) you should be fine.
Yes the wheel is not hub centric to the MINI hub. I'd have to say if it bolts on & clears the brakes go ahead & use it. Temp spares are only to be driven on slowly & for short distances anyway.