Not really sure what to make of all this.
FAA and EASA logbooks are not the same. FAA hours use the decimal points system and EASA is all hours and minutes.
I was always under the impression that a flight done on an FAA license sould be in an FAA style logbook and Easa in a european style logbook to include the time of dep and arr.
obviosuly i use a spreadsheed to find total hours, and i would like to hear from somone who actually has dual FAA and EASA licenses like me to see what they do, and not just suggestions on what seems to be the logical thing to do.