Im sorry, as I have no valuable information for you.
I do know it has been done plenty of times. I have no tips for doing it though.
I got extremely luck when buying my car, because, it had lots of extras I didnt know about till I learned something,.. The previous owner had boxed in the stock arms and it felt great (not wobbly, or weak as some mention.)
I, myself being lazy and cheap would leave the 30k bushings. Im not sure about something more firm though.
Hope this Helps