So buy the needed connectors with the wires attached to them, and instead of trying to make the connectors by crimping TINY ends, or soldering, make them work by bringing 2 wires together instead. I have that same problem myself. This method works real well when doing a daisy chain. It can get a bit more complex when dealing with RGB, but it's easier to crimp up a bunch of .187 or .110 wires with male/female ends then it is trying to make some tiny ends to plug into an iPac/Pac LED 64. The only REAL difference here, is it just looks cleaner on the inside when you make the needed ends over splicing 2 wires with crimp ends.
My honest opinion of that, is nobody is gonna be looking inside but you. As long as you know how you made it all work, you should be good.