Robe of arcane heratige for oracle

Hello again everyone, I am working on a backup character and am building Iceman from the x men, I think that the Winter Oracle is the best fit, however I know that out campaign will never see 20 for the final revelation which is both great mechanically but mostly for theme.
My question(s) are can you use craft wondrous to make a (x) slot item to mimic the robes of arcane heritage in granting the final revelation at 16? how much would this be? Spells needed?

Last as a thought exercise am I right in winter oracle or is this way off?

unapologetic self-bump

You are in the wrong section, this would be pure homebrew. Personally I would allow it but might make it a fair bit more expensive as the mystery capstone powers tend to be more potent than the bloodline ones.