You CAN master the 4 hole and make perfect microfoam (I had the same problem with the LC when I first got it).... I can now texture enough milk for just one drink with the four hole..... just takes a bit of practice!
The CoffeeParts two hole will fit..... but the holes are a bit too small.... you will need to run a small drill down them to open them up or it will take forever to texture your milk....
But if I was you Id persevere with the 4 hole - once mastered it is magic!!!!!