I actually appreciate the blinking light, as it gives me a warning when to get out, before the mirror comes down.
I've cleaned my K-30 numerous times, if the battery is in order and fully charged, it shouldn't be a problem.
I normally have it open for not more than 30 sec at a time..... keeping swab ready, removing lens, activating mirror up, turn around, swab both ways, switch off replace lens and go and check outside with a shot of the sky to see if I've got it clean enough. If you need to have it open longer than that, the chance of more dust entering the camera while you're cleaning it, is probably higher....
Lately I don't even check it at f22 any more, only f16, as I never shoot at more than f10, so if I see nothing at f16, why bother cleaning it