In my TL "Golden Eagle" where Napoleon I makes a Permanent peace with the Coalition in exchange of French Natural Borders + Piedmont and Catalonia, Louis Bonaparte became Emperor of Mexico, would his son Napoleon III be a suitable match for Queen Victoria ? What changes could be expected from this Union ? Would the British Nobility accept a Bonaparte King-Consort ?
No, not in a million years. For 500 years from the outbreak of the Hundred Years War to the aftermath of the Franco-Prussian War France was generally Enemy number one and a reasonably triumphant Napoleon would be a large and intimidating presence across the channel. The marriage of the heiress to the British throne to any Frenchman would be an incredibly big ask, to a usurping Bonaparte who is extremely close to the French imperial throne is inconceivable.
The requirement for Victoria's OTL match was:
Safely Protestant from birth
No strong ties to any major power
Unlikely to inherit anything important.
Prince Albert met all three, Napoleon III meets none of them.