Well, the time span is about a day on Dagobah and the Palace. So Yoda dying in the morning and Luke departing in the afternoon is not a problem. Of course, you need to accept really fast travel times 😉
But we need to recolour R2-D2 to make him another droid! Having another droid could also be a nod to the prequels.
In there some dialog where Luke mentions a number or a letter ?
Rejoining the fleet briefing would need some extra work.
Anyway, these are very interesting ideas 😃