Jim Cate's solution is obviously well tested, & it'd get my vote. Especially for being KISS & (relatively) inexpensive. Kydex might be another similar option, though you'll need to heat it to bend it to match the bow contour.
Can't say as to how it'd hold up to long term UV though.
But... If you just have to have something trick, & a bit different from everyone else, you could custom laminate up a Kevlar "Cod Piece", with a bit of mold
release or packing tape between it & the bow. And then once it's cured to shape, pull it off, do the final trimming, add a few layers of Spectra cloth to protect the Kevlar, & then glue it into place as Jim did.
Keep in mind though, that Kevlar does absorb water
, as in it wicks it. Thus the protective layers over it. That & it's UV sensitive. So semi regular varnishing would be a necessity.
Still, it'd look trick, if done right. And you could always add SS, or Titanium "armor" strips to it if you so desired. And said strips would look even cooler, if heated until you achieved some pretty, "straw colors" patterns on them.
BTW, if you go to all of the bother of having something in SS fabricated, why not have an artistic pattern on the aft edges of it. It'd be both unique, & pretty.
Who knows what "doors" such a thing might open. As a conversation piece, & or to perhaps get your boat "favors" with harbor masters & such.
Give a metal artisan a bit of free license
, design wise, & I'm sure that he/they could come up with something gorgeous.
PS: Also, I'd imagine that bedding a metal plate in s custom, reinforced, resin "pad" would help to mitigate the denting by a good bit.
Meaning, tape off the section of the bow where it's going, & mix up some epoxy
& chopped glass fibers to bed
it into/on, so that there aren't any gaps at all behind it, between it & the hull