I’m a bit perplexed as to why anyone would touch onbrard cards and ASIO4ALL in a studio.
If I’m not mistaken, you and Brandy must be talking exclussively about having two sessions open just for data exchange, and the main session would be using your primary soundcard. This should work fine.
For anything beyond that, I’d read the ASIO4ALL and the card it’s wrapping specs first, try it in practice, and examine the results’ sound and relevant audio measurements very carefully under all possible configurations. Going by memory on the specs alone, it’s certain that you’d run into issues of all sorts.