S&S has some of the Parkhurst clips, for $150 a whack.  If you look at pic Butler'sRanger lightened, you can see, the rear slot is angled to pull the tab back, sorta locking the stripper in place.  It probably wouldn't take much of a nudge to get them falling down in there, depending on the fit of the clip to the rim.

The problem I see with having a Parkhurst device attached is not in the use of the device.  For example:  If there were only 100 original devices made, and 250 people showed up with them, then 150 would obviously NOT be "As issued."  (yes, I know... these numbers are for example only)

Now I'm not saying that 5 or 10 shooters with Parkhurst devices would not be allowed as "As Issued"... just as someone with a replacement handguard or trigger assembly wouldn't be a disqualification.  However, what I am saying is that all Krags have a hand guard.  All Krags have a trigger assembly.  NOT all Krags have a Parkhurst, and the odds that 30 or 40 shooters would show up at a single event with an actual Parkhurst device installed would be extremely slim, given that so few of the actual devices even exist!

That's a good point.  Even an 1892 may have a 1902 sight on it.  It would be hard to narrow down, although an 1896 Krag with a 1901 sight and a stock with no cartouche issued to a National Guardsman stationed in England in 1917 would still be "As Issued" because it was issued by an armory to a serving member to be used in service!

It does murky the waters just a tad...

the Clips I have would not without modifacation so can say.

Possible but would have to have a way to stop the clip from going all the way down. As I have no drawing to go by I cant say for sure nor do I have th access to one to check it out, as I would be willling to cut up a E to slide intonfield clip with a notch to allow it the Parkhurst and  then stop it at the right hight to allow rounds to cycle into the mag. The last issue would be if it would hold the rounds without sliding out of the clips.