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I have considered it. What type of cover were you running? I ran my shorthair 9 hours on the east side last weekend and she had minor eye and nose hair abrasion. We saw cattails, thistle, tumble weeds, grasses.
My GSP had the same issue early into dove opener this year. And from what I read that area around the eye will toughen up and you'll stop seeing such rough abrasions. I read from an old timer that if you aren't training the dogs in the same area you're hunting (or similar make up) and they aren't coming into the CRP fields consistently and high cat tails and sage brush then the portions of their body that get the most wear during hunting don't get a chance to get those "calluses". We used some "paw relief" https://alphadognutrition.com/collections/nutrition/products/paw-wax-relief balm around his eyes and they healed up right away and haven't had the same area abrasion all season. As far as the Rex Spex goes - I don't know of anyone who uses them but I've heard they can be pretty handy in the right situations.