Sounds fun to me.

My only idea to make the hunt log interesting at 50 was to give like a daily bounty for certain monsters for seals/phils. Give people a reason to go out and hunt something. Make it decently hard, too. Soloable if you're good, but best to take it on in a small party.

I like your idea better though. Maybe make the currency monster parts and let you use them to let an npc (or yourself) craft weapons and armor ala Monster Hunter? Ranging from i55 to i70 to give people more options for gearing up and vanity armor/weapons?