Howdy there.
I have the same dilemma. I'd say my favorite drill is a bill drill at 10yds, 15yds, and 25yds taping in between. Kind of like a modified version of the Max Michel triple six drill. Probably less productive, but hey, you've gotta run with what you've got. Other than that I do a lot of 2-reload-2 and failure to stop.
I use a classic black B-27 with a piece of white paper 6"x11" taped to the chest and a 3x5 card taped to the head. Every once in a while, I'll fold the B27 in half upward and tape up two 1/3 scale targets (like this one, http://www.tgscom.com/images/sharedimages/GlockFAQ/ipsc.pdf) at the opposite edges of the folded B-27. I feel like the tiny A-zones sharpen my front sight focus, plus, you've got a small transition to play with.
Hope this helps. Keep on keepin' on.