Split pages which are destined for double sided printing

Hi!

I'm looking for a practical solution:
I'm doing an editorial project that its' spreads are the size of an A1 and then its' pages are A2, somewhat like a newspaper. It will be printed using saddle stitch order.
The problem here is that for it to be printed I'd have to double side plot the entire thing for it to be practical, but since its a project I need to print it multiple times to do corrections and see it in its' real size because of typography. I'm thinking to go for digital offset, printing lots A3 in black and white and then manually sticking each page with another, but that requires me to divide on the computer each A2 into half, A2s that will have to be double side printed and its a mess to do manually because of the order of everything and the time that it takes.

Question is:
Is there any way to do this very specific thing in any automatic way? Just having every half printed in order, with its' correct pair on the other side and everything. Since printing in A3 would mean that there will be no spread printing, just individual pages, because of the papers' size, it wont be saddle stich but consecutive order.

I know this is kind of messy to explain but I hope that someone has the answer for this. I'll appreciate it 🙂