jamwerks,
you don’t actually need hidden time signatures.
Just write your music in one big flow (without time signature) and then in Engrave Mode make System breaks where you need them.
If you like to try, make a file copy of your project, then in the copy delete all time signatures, one by one.
You will end up with one flow (or bar, if you want to call it that way) of your music.
Then just, as explained above, do your System breaks, wherever you need them.