I find this idea very interesting, the inclusion of the ID of the users who are voted for.
It is true that it will be more work for those who vote, but it will guarantee the votes for those who change their username.
It might even be easier to collect votes with that information.
Considering how many years he waited for the fulfillment of his desire, I do not think that this idea will be relevant. On the other hand, I know another user who managed to change his nickname twice, to whom the admin was favorable. What dances with a tambourine other users should take to convince the admin to change their nickname can only be guessed at. Therefore, changing nicknames to numbers, I think, would be just extra work for the one who will calculate the results.