Hypothetically, if the cab of the 332 was buried then the lack of TPWS would be mitigated, as it would be fitted in the leading cab - a Mk1 coach for example isn’t TPWS fitted but the loco or whatever is dragging it is.
But You’d need to box in both ends - so that would entail running 12/13 (4-333+4/5-332+4-333) - with 23m coach lengths that’s impractically long on almost any route, never mind Leeds/Bradford/Ilkley/Skipton. And the on train software on the 332 certainly cannot cope with units running in triplets, I suspect same applies to 333s. I’m also dubious they would actually work together - they have the same couplers, but some of the control electronics are vastly different.