I have been painting too much: I still seem to think in acrylic pigment colours not in DMC colours.
Like I always seem to do when working with colours, I looked for the acrylics I can use to mix them. I chose light ochre, English Red and Indigo, together with white for the mixed colours. Basically the yellow/red/blue colour scheme in somewhat muted colours. I show the pure colours and equal mixes, and how I made the tif colours from them.
The blues are just Indigo and white, the ochre is light ochre as it comes out of the tube, the beige is light ocre and English red in equal parts plus loads of white. Of course, you could just use water + the effect of the white paper to make it more light. As a comparison, I added the original palette again.