Removing the datewheel on an a7750 isn't that difficult (of course it's all relative). I've seen some good tutorials. I'd give you the link, but i'm away from my main computer right now.
You can try making an overlay. The difficulty I've had is getting alignment right. I've tried waterslide decals and press on decals. Every time I try, the alignment is off (that's why I used a Pad printing process). You really need to get things exact or you'll see that it's off once installed. If you have patients and a good eye, you could probably do it, but don't expect to be able to get it right the first time.