Just to make it brief - if the link seemed convoluted:
Set master length to 16 but track lengths to 64, then there are three pages on each track that you can work on without affecting audio.
Paste them into page 1 when you want to hear them.
It’s one track at a time just because you can’t paste on all tracks - but ‘develop’, sure
further:
“Paste” again at any point to perform an instant undo - i.e… back to original page 1 pattern - good for fills dropped in anywhere
ie. this is also the only way to ‘instant pattern change’ on the OT afaik