We did the same thing experimenting with a Scarpa Gea and some BD AT boas. The outcome was a much stiffer boot and additional weight. She ended up not liking the way the boots lost ROM for hiking and went back to the original liners. I think a big issue for you will be the same plus there will be a clash with the boa knob and the power strap.
you would have better luck with the taller AT boas. IMO.
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