I'm back from SD and can report that the Kestrel 5700 mounted in a wind vane + HUD + Terrapin worked flawlessly for my one buddy. The update time for the HUD after lasing a target with the Terrapin was less than 10 sec. In addition to providing target distance the Terrapin also includes direction of target/fire which is quite critical when dealing with steady 10-15mph winds.
As for the Kestrel 5700 it worked flawlessly mounted up in the wind vane providing real time data. Battery life was better than I was expecting, clocking in around at 15-16 hours while connected to a LRF, HUD, while feeding continuous wind data and plotting hundreds of firing solutions on PDogs.
I would like to thank whomever at Kestrel had the foresight to enable user editable range values via the buttons! It was a life saver for me when my LRF would routinely not communicate well with the Kestrel. I'm 100% certain it's a LRF issue NOT a Kestrel issue. Overall, my buddy's experience with the Terrapin was much better than mine using the Bushnell Nitro 1800 which always had to be "woken up", then reestablish the Kestrel connection, then update the HUD with firing solution.
Overall we were both extremely pleased with the 5700's performance in the wind vane and HUD integration!!
Picture of his setup below: