I'm by no means a real car mechanic. Some guys have built a ton of mopars and taken these cars completely apart and put em back together. The only real mechanical experience I've had is working in a nonprofit bicycle shop for kids in a low income neighborhood. Lots of our tools were homemade and we'd often put together bikes with all the wrong parts and find some way to make the tools we had (what wasn't stolen) work for us.
I'll contribute what I can - but honestly, I'm just making it up as I go along.
Some tools, I think, can't really be made unless you've access to machining equipment (and have the know-how to use it). And some tools have to be bought, just simply because they perform precision work. IMO, pressing stuff in isn't really a big deal.
That said, are you guys lubing up your UCA bushing shells (the metal part) before pressing them in? It was kinda rough going in, and having lube on the metal might be a good anti-seizing thing to do in case they ever need to come out.