Drummond does not have that type of value. As a player or a trade asset.
Drummond does not have that type of value because his defense is more good than great and his offense is extremely limited. A non-passer. A dodgy post game. No scoring outside of 5 feet from the basket. Terrible FT shooter. His rebounding is superb but Drummond needs to bring more to the table on offense & defense along with that rebounding to be worth parting with a #1 pick for.
I am happy to trade the #1 pick for a big man but the only big men I can think of with enough talent for that to be worthwhile are Anthony Davis and Karl Anthony Towns.
I can see the argument for Porzingis but I am not wholly convinced on that. I think most of the other top big men are too old or are not talented enough. Actually, maybe Nikola Jokic. He is very skilled and still young. Jokic would be a great fit in this offense. He is one I would consider as well (but, like Porzingis, still leaning more towards Fultz).
Oh, and Draymond Green. Add him to AD and Towns grouping.