I voted Springer because he's been doing it for years and would be the most successful in that role. However, after looking into it some more, ****if he is open to it *****I have no issue hitting him 3rd. As good as he is with the bases empty and/or leading off an inning, he's even better with RISP. If you want to go:
Bichette
Biggio
Springer
I could see that. ..I would like to see Bichette free to use his speed a bit more on the bases. Biggio is always free to do what he wants as he seems to know when he can get a base and when he can't exceptionally well. Putting him in front of Springer doesn't change anything for him. Bichette was great hitting 1st in 2019 and hits a lot of doubles hitter.