You could look into using fobs instead of fletchings. They are a circular "fletching" that pops off on impact. You can then tie very light string to the fob and stuff the rest of the steing inside the arrow. That way the fob pops off where you hit the grouse and if the arrow keeps going, it leaves a trail of string behind.
Keep in mind this setup requires a drop away rest and fobs aren't readily available in stores
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