To make a tip pointier requires removing steel and profiling the knife shape to be longer and thinner. You already removed the thinner elongated point steel when you repaired the damaged tip.
On top of this the 15º per side bevel is a taller thinner elongated bevel as compared to the 18º per side you want to reprofile the bevels to. You are really going to be applying a micro-bevel on top of the 15º bevel. If you want to remove the existing thinner 15º bevel and replace it with the 18º bevel profile you are again looking to remove a lot of steel. As you remove the steel you are moving the knife edge lower into the wider thicker portion of the knife.
To do both add the thinner pointier tip and remove the existing 15º bevel and replace it with the 18º bevel again you’re getting into the proportions of the knife. Everything is proportional. To regain that original thinner pointier knife shape and new 18º bevel profile will require in essence grinding or making a scaled down version of the same knife. You’ll need to remove steel all over the knife. (This isn’t restoring a car where you can replace the steel and weld on new parts.)
IMO, enjoy this knife and use it as it is. It’s still a nice knife. If you want the profile of the original knife get a new one.
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