I want to underscore what Lugia said about MD needing a quantizer, if you want to play notes in tune (not needed for triggering samples or percussive sounds). The Ladik Q-040 isn't available right now, and Ladik may not ship to Australia anyway. Honestly, I would wait on MD, and see what you can do without it at first. It shouldn't have supply issues if you want it later (famous last words...).
Maths isn't needed but some sort of envelope generator would be nice, since Pam's is limited in that respect. There are lots of possibilities.
3xVCA, if you can get it, is a fine bridge to Veils 2020, and will still be useful afterwards. I don't think any of the Veils clones or modules inspired by Veils (e.g. Intellijel Quad VCA) have the same four-slider interface as Veils 2020, but I could be wrong.