There is no guarantee the 175 will even be offered in a given class. There have recently been a class with only one and one class without any. Delivery of the 175s is about to lull. The last of the first 40 is soon and then no more until the four in November and December.

With 175 sim time at a premium, it would make sense to continue training. Doing things that seem to make sense don't always to the people making decisions. If that happens, though it will lead to a temporary excess and increased reserve time.