Mainly a suggestion by Mads Mikkelsen, although with some precedent (Sean Connery returning to the role 3 times, although the second was 'unofficial' and the third was a video game adaptation of one of his movies)
Of course the big issue is that Bond dies at the end of "No Time to Die", which would mean he either somehow survived getting killed by missiles *and* somehow managed to either avoid Madeline and their daughter for the rest of his life or theirs or gets cured of Herakles all together.
The only other idea would be to have the film take place during his most active time presumably between Quantum of Solace and Skyfall (Which probably means no Q, Moneypenny, Mallory M or Blofeld except maybe cameos). Felix could return but Judi Dench has eye health issues so her M would have to be limited.
Probably never going to happen, but as Jeffrey Wright would say, What if?