I finally broke down and ordered a Permagrit sanding bar. Everyone says “you've got to get permagrit tools” but you never truly appreciate it until you have one. What a difference. Cuts through flox like butter.

So I was able to make pretty quick work of the new leading edge shape. Very pleased with it. It's ready for micro. And then after much web research I learned that I need to be apply a skin coat of epoxy to seal the micro before finally sanding and high build primer. Makes sense. I ordered some foam brushes for applying.
After punching out the blind rivets that are holding the fairing in place, the clecos don't hold as tight as they used to. Which made me concerned that the replacement rivets won't hold tight either. A lot of folks bond an aluminum strip to the inside of the fairing to prevent crushing of the fiberglass and a rivet pullout. I decided I might as well go that route while I have it opened up.
Mixed up epoxy and laid two more layers on the front of the fairing to close up the rudder gap and then mixed remaining epoxy with flox to bind the aluminum. I primed on side of the aluminum strips with self etch and scuffed the other side prior to bonding.

Was able to get the micro applied before bed.

Purchases: Amazon: permagrit sanding bar, foam rollers, electrical tape.