I think this is the best you'll get. Don't flavor your 2 spells per lvl as "researching something new", it is instead, having deciphered what you wrote almost a century ago, and regaining that knowledge.
For comparison, about a month ago I was checking some old 3.x builds I did, and I don't get half the things I wrote there. Back then I had all the books in my head, so just writing acronyms for feats, PrCs n items was more than enough. If I wanted to understand them now, I would have to sit a read for a while.