Apologies for not answering your question, but have you considered a pair of 15x or higher power binoculars on a tripod for this role? I recently picked up some great 15x glass and I'll be sending my compact spotter down the road. There's something about using both eyes that enables the brain to process so much more detail. The first time was astounding. I'd say the first second behind them was nothing special, then the image came alive in my brain and I was noticing much much more.
One way to experience the difference is to try reading small font with both eyes vs large font with one eye covered and see which way you can read faster.
I'll keep my large 88mm spotter for when I really need to use 45+ magnification to determine the legality of an animal, but I've come to realize that the binoculars will do anything that would want a compact spotter for, better. To top it off, I wouldn't have the eye strain and I'd glass more and find more.
