ATP's delivery issues aside a number of members have reported success with that kit. So don't write it off yet. I think you need to sort out the idler first.
Have you actually seen those ATP wishbones? They are down there with the crappiest aftermarket (OK, maybe not firstline shite that ECP like to pedal).
Given that the single most expensive "part" is the setting up afterwards, you'd have to be a bit odd to want to replace then annually.
Hence, refurbing the original GMs is always best. The polys are expensive initially at £45, but last for life. Rear GM bushes last about 3-5yrs, even with my driving style, and last set I bought cost about £28 a pair, delivered same day - might have been ex vat though.
Rear bushes can be done in a vice normally, unless really seized, in which case you cut it out, and use a vice to pop new one in. Slightly more effort than using a press, but not many of us have a press.
Fronts will need cutting out (or a press), but once polybushed, only ever need regreasing when you next replace the rearward bush in a few years.