I have never had to deal with LIDAR myself and have therefore not read any manuals. The courts have ruled that a proper test for RADAR is to follow the manufacturers recommended instructions. It should therefore be easy to argue the same applies to LIDAR. Now if indeed the lidar manuals only recommend the before test, then it is going to be very hard to convince a JP it should also be after. A few JP's may agree but probably most will not. This is where an appeal would become more costly because you would need a very good lawyer to argue the case in front of a Judge and then you may or may not win.
When I said appeal does not have to be costly above, I was assuming that LIDAR manual had the same test requirements as RADAR of before and after. So if indeed LIDAR manuals only recommend the before test, then it will be significantly harder and costlier to win.
I am not saying I agree with courts decisions to simply defer to whatever the manufacturers say, but I understand that until the currently rulings are challenged, it is an uphill battle.