Krieghoff makes a Safari Drilling. I think you can get 500x500x20 ga.

When first handle the Krieghoff or the Blaser with their cocking system they do seem hard and ackward. Kinda like the first time you try to ride a bycicle, or ski.
After you handle them and shoot them for a while it becomes second nature.
I would prefer the Blaser rifles to stay "cocked" but after shooting mu Blaser K 95 for a while it is secind nature to recock the riflke after reloading. It is all a matter of practicing and being familiar with your equipment.

I think a regular drilling has the most use of the combo guns for me, however a double rifle drilling sure has its appeal. This is why I am considering a Krieghoff Quadro in 12x12x9,3x74R with an insert barrel in 9,4x74R. That way I would have both in a much smaller package than a drilling with 2 sets of bbls.
I am waiting on Krieghoff to email me a picture of such a drilling here in the US.