Re-cycling / Upcycling Used T coco fibre substrate

So, I lost my OBT and poured his old substrate into my (now winter dormant) organic garden outside. Waste not, want not.
But I have used G Rosea substrate from a recent substrate change (I was looking for a lost mealworm) and I am not sure what to do with it. I figure there are urticating hairs all through this used stuff. Is there some use for it? I know birds and squirrels dig through my gardens outside, so I hate to put something possible dangerous out there for them to dig into to.
Could I use it mixed in with dirt for maybe a houseplant that will receive no animal contact?
Can you even use coco fibre substrate for plants?
Do I toss it? If so, in the trash?
What do you guys do with used substrate?
(This isn't an attempt to recoup costs -- it's cheap -- I just hate to waste things)
Thanks in advance.

And the first time you go to mess with the soil of the houseplant, you'll regret deciding to use hair-laden dirt. Plus, those hairs can blow through the air. Personally, I'd dump it.

Julia said:

And the first time you go to mess with the soil of the houseplant, you'll regret deciding to use hair-laden dirt. Plus, those hairs can blow through the air. Personally, I'd dump it.

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Well, yeah, I guess there would be that. Maybe I could buy some halloween cup-cake topper picks with skull/crossbones and stick them in the plants that I use it in.
Or I could toss this used co-co substrate in the trash and move on with my life.

I dump mine in our vegetable garden. There hasn't been vegetables in it for years though so it's just a box of really nice dirt now lol

This is an issue I hadn't even considered, and I am very much into composting.
How long do you think urticating bristles would take to decompose when buried? My pile's kind of large and enhanced with rabbit manure, and I find that snake skins dissolve in less than a year. if I don't bury them they last longer and end up looking like old plastic and cellophane wrappers blowing through my yard.