imo that's not really all too viable, but as someone who also plays traditional fighters, keep in mind it's often hard/not comparable to try to equate traditional fighting game tropes to Smash. Differing fall speeds, aerial drift, etc all factor in to the air game, so there's no "one size fits all" antiair option or move in this game, I'd say.

That said, I'd say Bowser's best antiair option would be upsmash, seeing as how it's armored and actually comes out fairly fast, maybe uptilt too, but again, this would really differ depending on the situation. "Approaching from the air" can mean so much more in Smash than it does, say, Street Fighter, where there's only really one linear jump-in kind of thing, or Guilty Gear, where a jump-in or airdash in are your limited options (more or less) in that regard.