Kaloraszegi stitches take way too long.
Here’s a quick way to get the design onto a t shirt:
Print the Kalotaszegi design onto multiple A4 papers tiled, copy it to the freezer paper on the paper side not the plastic side, cut the outline using an xActo knife.
Iron on the freezer paper stencil, plastic side down towards the fabric
Place a piece of plastic or cardboard under the design, in between the layers of the shirt.
Using a foam brush, paint over the paper to cover the fabric really well.
Let dry and then iron it on the backside to treat the paint and fix it to the fabric.
It has been in the washer/dryer a few times, lasts pretty well, but the paint will crack if the fabric is stretched.