Current MCH would actually transition to getting walking casts pretty well. Replace the Clean Shot combo with Blast Charge, it grants 5 or 10 heat per use, and after every 3 Blast Charges, you get an off global attack that grants 10 battery. All multitools, and Blazing shot would still be instant so there would be plenty of options for mobility. The main issue would be potentially cutting back on double weaving. BRD would need more work to make walking casts work, and DNC should not get walking casts as they would disrupt its flow too much, and it already has pseudo casting mechanics with its dance steps.