Man, that was a lot of fancy words in one post.........:roll:
I would agree it is not a good idea, however, it can be done, maybe.
If the impedance of the transformers are close to the same, the better. Circulating currents will occur which will cause heating in the transformers. So, if they are lightly loaded than should not be a significant cause for alarm. However, as the loading increases, you may encounter undesirable operating temperatures.
Since the reason for the question is unknown, the answer is vague.