on my nissan i just took the hubs to a machine shop and they charged me 120 bux to redrill all 4 hubs. i dont know about a mazda but it would be worth callin a couple machine shops and talking to them about it.
you keep the mazda steering, but splice the yota tie rod end onto the mazda piece, that way you dont change much, i had yota spindles on my mazda, there was alittle bumpsteer, but hardly noticeable, the toe didnt change much at all.