Hi there!
I just read your post and wanted to respond that yes, it is possible to be dilated and stay there. I have been dilated to one since 26 weeks and was still about the same when I went in on Monday! I will be 30 weeks this Friday. I did not have a cerlage in place, but besides a little more funneling each week, everything else seems to be holding strong.
The doctors told me at 26 weeks that I probably wouldn't make it to 28, but I did... then they said 30 and I am almost there so have faith you could keep cooking for another month or more!!!
My best friend just had her second baby at 40weeks4days after being dilated to a 1 for almost 2 months so I know it is possible!