In terms of self weeding laser transfer will be a better choice. I am pretty sure you noticed that JPSS leaves a polymer window on light and pastel color shirts. Where 2 step self weeding ImageClip laser light does not. It is ideal for white, light and pastel shirts. It is cold peel and leaves the majority of of the toner on the shirt. Hence the transferred image is vibrant.
To properly use it is after transferring the image wait 24 hours, because the polymer becomes brittle before wash that will crack when the shirt is stretched, then cover the image and press it for 15 seconds at 375F with very heavy pressure fro durability. Stretch the shirt while warm for soft hand and minimize cracking.
If you add black toner/drum set filled with white toner you can us the CMYK laser printer for 2 step self weeding Imageclip Laser dark and Koncert T transfers. Again like Imageclip laser light wait 24 hours then repress and post stretch.
The photos below were pressed with Imageclip Laser light. Notice that there are not polymer window.

Imageclip Laser Light - Front mockup embroidery

Imageclip Laser Light - Back mockup embroidery
The photos below were pressed with CMYK + white on Imageclip Laser dark and Koncert T.

Single pass printing with CMYK + white on Imageclip Laser Dark

Negative black and white halftone with white toner on Koncert T.