I don't have a drilling, though I've often considered buying one. I think you should consider what's probably the big reason behind the flip-up rear sight: the possibility of encountering wildschwein (wild boars) and the need to be able to take one with a fast snapshot, either on a moving target or at close range. For that purpose, the flip-up rear sight is appropriate.
To that end, the video from Bavarian TV on this linked page http://blog.br-online.de/quer/winzer-schreck-wildschweine-versauen-jahrhundert-eiswein-08122010.html
is useful. About halfway into the video, you'll see a number of boars running and that should give you an idea of how fast a target they make and why messing with the flipup sight is probably not as good an idea as putting a comb pad on the gun. For those desiring pinpoint accuracy in a drilling, that's why they came up with claw mount scopes.
To summarize the video for those who don't speak or read German, the story is that last fall a lot of vintners in Franconia (the northern section of Bavaria) left a portion or all of their wine grapes on the vine in hopeful anticipation of an early sharp freeze. Not harvesting the grapes until they've frozen allows the vintner to make eiswein, a ridiculously sweet, concentrated and expensive wine; freezing concentrates the sugar. In the video, you'll see some harvesting - each of the yellow grape boxes is worth about 60 Euros.
Well, last fall they got their wish. During the end of November winter set in hard and they were looking at a record crop. Until the wild boars ate most, if not all, of the crop. So, to try to rescue the remainder of the crop, the landowners called in the hunters to take a chunk out of the boar population. Most of the video is about making eiswein and you won't see any actual hunting, but you will see it presented in a positive light. One of the first lines in the video, as they show boars being stacked for post-hunt ceremonies, is "this boar has eaten his last grapes". And they close the video by commenting how the roast boar will make an excellent Christmas dinner, accompanied by the little eiswein they did get.