Removing Dirsync and Last On-Premise

Hello,

I'm trying to get an answer to my theory in my head how to remove last exchange in a hybrid setup.

Currently in hybrid with dirsync & Exchange 2010

I know you can't remove remove last exchange and keep dirsync.

My question is, Can i remove the dirsync then remove last exchange and about a month later enable the dirsync without needing the exchange?

Does it still cause the need for ADSIEdit ?

I can't find any information on this way

Thanks