If someone comes to me with a logbook signed by another FI and the hours for renewal, then yes, of course I will sign the form. The other FI has signed the book, it isn't for me to start refusing revalidations just because I didn't sign the log book or do the flight myself.
Personally, I annotate with the phrase "Training flight" and my licence number and signature, just to ensure there isn't any issue.
But you expect to be able to call around every examiner you know and ask them not to sign the licence revalidation on your say so?
You are indeed a sky god.