Have you considered using a computer? I’ve never tried using a notebook but I know I’m a much faster typist than hand-writer.
I’ve been doing morning pages on and off for about 2 years and it’s pretty evident that the on periods/days are much better than the off ones.
One thing I always struggled with was getting started, or running out of things to write about before my word target. I decided to try building a little app that helped with that issue by providing written exercises in the form of prompts and see if that helped. It definitely does, it’s made writing my morning pages much faster and easier, without any negative impacts. I’m still working on cleaning it up, but it is in a working state and I’d love any feedback if you want to give it a try :)