I've compensated for this problem a couple different ways... As you suggest, starting the timer after the film is in the fix... or sometimes setting the fix timer to 20 minutes before starting and making sure the safelight isn't switched on. (I also have to ask myself why I plug the safelight into the "enlarger" socket - another mistake with potentially devastating consequences)...
Originally Posted by Photo Engineer
I think I will dedicate a wall socket for the safelight. (I don't "need" the light table plugged in all the time).