You are makinglife far too complicated. If they're both legal, the mixture will be legal. I and a friend have both mixed different sets of cleaners with good and sometimes indifferent results. I stick with straight cleaners from the bottle these days.
Your only true worry is not whether or not the result is legal but whether there are ingredients in the two cleaners which will react in a bad way, like form a gas or some other dangerous mixture. For that, you'd have to write both manufacturers and ask them what their ingredients are. Of course, they won't tell you ......
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"None are so blind as those who will not see."
