Getting rid of the balance shafts is an engine out job imo. Too much stuffing around trying to clear the passenger chassis rail, then trying to rotate the bearings.
Not worth it, especially on a stock motor. Just swap both belts, new tensioners/pulleys and be on your way.
after doing it, i would not do it with the engine in the car, getting the front balance shaft rear bearing out can be an ass of a job, also having to pull the sump in car sucks.
I just replaced both timing and balance chaft belts.
Gates make their racing range (the blue belts) so you could at least use one on the balance shaft belt to be sure you have a better belt on there, if you dont want to take out the balance shafts. Didn't cost the world either.