If I was playing Messiaen for normal (!) people I would definetly NOT play a piece such as the one you are thinking about.If I would play piece from Vingt Regards sur l'Enfant Jesus I would play a slow and mediative one. It is a long time since the last time I listened to any of them but No.1 strikes me as the very best. Are you thinking about playing some of this pieces that have nothing to do with religion? The preludes are amazing.
No.1 would probably be the most "normal" sounding of the set. Do you advise then something not to eccentric?