The internal mics on a DR-05 are surprisingly decent. You'll want to be closer to the stage/speaker stack with the built in omnis. If you're say 25 meters back, it's going to sound really hollow/thin. If you're farther out, you'd need something like the DR-22wl which has cards however it's not quite as compact. Something like the Sony PCM-M10 (long out of production) or the Roland R-07 are much smaller but I've never used the internal mics on either. Don't have a H1 so no idea on that one.
As far as putting it in your pocket, if you're closer to the front with VIP tickets, it should work ok. Just remember it's going to pick up any "face" noise you make 
For getting it in the door, discussion is best saved for PMs.
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