Yes, you can always take any class in any order that you wish to fit your scheduling or budget needs, however, DPS will only process certain licenses in a certain order.
*In order to get your Bodyguard license you need to have your Commission license. In order to get your Commission license you need to have your Non-commissioned course complete.
Pepper Spray, Handcuffs, Conductive Energy Weapons along with First Aid can be taken right away, as you can use and carry those items immediately as a Non-Commission Officer. As far as Baton and firearm, you must wait until you have your Commission license before you carry those.