I guess so and if they married I think It could be successful And have many children after all in OTL Adelheid married Frederick VIII
of Schleswig-Holstein and had seven children which one of them ended up marrying Wilhelm II and considering they had many children I think the Bonaparte dynasty could be secured and probably last longer.
Interesting idea, to be sure. And as to Victoria's disapproval it would depend on the "how" of the match. OTL she refused - or rather, she didn't have to refuse, but rather delayed because she couldn't do it without it seeming a diplomatic slap in the face for the French, - and got saved by the fact that while Morny had been dispatched to see Feodora and make a formal suit when word arrived from Paris that Napoléon III had "met somebody else".
If the marriage occurs in 1847, then Napoléon II - assuming things in France are on their more or less OTL trajectory - is a simple Austrian princeling. Victoria can refuse all she likes, but a) she's not head of the family and b) she's not risking a diplomatic incident like OTL. If it occurs after Louis Philippe's been tossed out, but before the Second Empire is proclaimed (if '48 is anything like 1830, Metternich and the Austrians will no doubt be making VERY sure Napoléon is under strong surveillance to prevent him escaping, and by that point, I suspect he'll be regarded in France as an "Austrian interloper", anyway) again, Victoria can go to the Orléans' at Claremont and shrug helplessly.
Other stumbling block was Leopold of Belgium. Although his reasons for OTL might not hold here. See, he had a tumble with Hortense de Beauharnais back in the day (he apparently spent time in Josephine and Caroline Murat's beds as well), and...well...then Napoléon III was born and Leopold promptly leaves Paris. That aside, he was in a difficult position regarding the fact that his father-in-law has just been deposed, but if Adele is marrying Napoléon II as an "Austrian princeling" not as a French emperor he might give way