NOTE: Blue Frogs Have To Been Online For This To Work
Find a blue frog which is near a respec npc. e.g mos eisly
Respec to a proffesion using the blue frog but dont level it yet leave the window open,
Open up the proffesion respec window using the npc,
select another proffesion. but dont go it yet. go back to the blue frog window and go onto set combat level type in 90 but dont press ok yet drag the blue frog window so the ok button is over the ok button on the respec npc and press both oks and your 2 proffesions

you can use both of proffesions specials and everything.
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You might not have to respec to the first proffesion before you respec using the npc. Blue frogs are down on tc at the moment so i cannot go on and find out again how to do it. But iv done it before and it worked for me!