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Ptown
Scilly.Suffolk
I hope so: I've built someone a TT bike without a NW chainring or a clutched mech...
The advice I got was that if you weren't using a wide-range cassette, chain slap was unlikely and so therefore was the risk of unshipping your chain.
The chainring does have full height teeth and no ramps or pins; the cassette is 12-25.
A clutched rear mech seems the most effective precaution to me, as it addresses the problem (chain slap) rather than the symptoms.