For the people that dont want to wait till 2.28 - there is something called macro in this game which you even can use for changing Classes
1. Save a gearset as normal (or use the ones you already have)
2. Write a macro containing the lines:
/micon "#" "gearset"
/gearset change #
/displayhead on/off
/visor
use on or off wether you want to show the head or not
# is the number of the saved gearset which you can find in the gearsetlist or as small number if you drag a gearset into a hotbar
use /visor if you want it to change from the normal look i.e. as dragoon if you want the helmet to open. Do not use the line if you want it to be standard
3. profit ^^
Have fun ^.~
P.S.: I use that with all my classes and different sets. Comes especially handy to activate additional skills on BOT and MIN b/c you can just add another line in.
P.P.S.: Remember that these macros will change if you change the number of a set and save it to another number.