If you want to use a different logbook, I would copy all the entries to a new logbook, and write a note somewhere in the front saying something like "all entries between date X and date Y are copied from other logbooks. No need to get stamps/signatures etc. If someone really wants to check up on them, you will always have the original with the signatures/stamps.
I have done the same thing, where i copied multiple smaller logbooks of SEP, MEP and Glider time in one book. I never have been asked to show the originals.