As a data point, my mast is full all the way with old styrofoam, (which being in the mast can't really be waterlogged) and it does nothing whatsoever to prevent turtling. If you cut the noodles small enough to slide down the extrusion you're leaving a lot of airspace unfilled. I feel like a hobie-style masthead float or sealing the mast would be more effective.
Given I was able to right my turtled boat solo (with a righting line) I'm just going to keep righting lines attached.
@GreenLake, you said you had filled your mast with pool noodles. Have you ever dropped your bare mast in shallow water to see if it floats? Mine with its styrofoam does not.
Edit: Correction, @jalmeida51 had filled their mast with pool noodles -- does it float?