If the Spherical rod ends are sealed...........then have at it. The spherical rod ends that are on most of the LCA's, UCA and PHB's are cheap and not sealed (most of the cheaper srb's are $20 carbon steel pieces where good chrome moly sealed ones are $45+) meaning they will get dirty, and this dirt will eventually destroy them. I have only run them on race cars because they are 0 deflection compared to poly which will flex.
If you run spherical bearings they will produce a lot more NVH than Poly.
Aftermarket "boots" are ok, but even they don't keep all of the dust out. I've used them on a couple of hot rods and the only issue is driving in wet weather they tend to keep moisture in and then become rusty. This is just my experience, but I can see no use for spherical rod end on the street, they were designed for the race track, not the street........IMHO