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1. We define a new block type of "endianessSwitch" ... this can either take a constant "LE" or "BE" (Or the long form, which might be more explicit) ... or an expression which evaluates to one of the two.
2. We add the BE/LE flag to type definitions (explicitly no dynamic hereBut a reduced form, which explicitly doesn't support dynamic endianess)

Now to my reasoning:

Usually, it will not only be one field that needs to be switched, so adding a flag to the fields would require duplicating a lot of the flagging-code to the mspec documents. Using a block of equally endianed fields simplifies things. And in addition to that it explicitly focusses on the detail of setting the endianess, which should simplify implementing this in the code-generation ... as a endianessSwitch simply gets converted into an allmost constant try-finally block.

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