PC on Zealous/Sundering Bramble Shortbow of Marksmanship

Its not the best req, nor are shortbows popular, but not horrible. Nice for barragers in Tombs or some interrupters I would think.

I'm buying a perfect sundering bowstring for 4k. So I might slap that on.

Would anybody be able to tell me which would be more profitable?

1. Sell bow as is and resell bowstring
2. Slap the sundering bowstring on and sell as that.

I also got a perfect bow grip of enchanting, is that worth anything?
Thanks.