I agree that it makes more sense for them to be regular skills, and then just use the FORK mechanism. Otherwise, style/maneuver skills are UNDER-powered compared to other FORKed skills, which: (1) give +1D to all actions, not just the last one, (2) give +2 at exponent 7+, (3) don’t require a restrictive attack pattern, (4) only require 1 skill point to open, and (5) usually open at exponent > 1.
I would also apply the +1D to all parts of the maneuver sequence, and dissuade cheating by (1) adding Ob 1, (2) forfeiting an extra action, or (3) both if the full sequence isn’t carried out.