>Secondary 2 x 12VAC or 1 x 24AC CT secondary @ approx
>7VA (would consider anything from about 5-10VA).

Could you use a switching supply? I know that ST have some nifty little
chips for small VA switchers. I have a copy of their app note AN1484 which
describes using their Viper12A chip in a 3.6VA wall wart with 100/230V
capability. Not the VA you are after, but they do have bigger chips.

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