Seems like wasting perfectly usable grains....It's not expensive so I'd toss it. It's not going to be as good as fresh. I wouldn't want to waste time on an unknown variable but if it's just fun to experiment with, then I get it.
"Old grain is like yeast--pitch it"
I searched for a Brulosophy article and found this...
It also has a link to a brew he made with old grains.
https://brulosophy.com/2018/10/29/the-impact-of-age-on-crushed-malt-exbeeriment-results/