You can do this but it is not as safe as just mounting on your speeder. If you dimiss your companion and get jumped by enemy player..
Also on your spec, I would spec out of valiance and put the the points into 20 percent bigger shield.
Another idea is simply to q for some warzones to get your levels up by one or two levels to make it easier and also have your warzone point to buy for your level 40 gear for both you and your pet.