The DixieII is a bit limiting, compared to the II+. However, my sugestion would be to sidestep these altogether and look at a Doepfer A-110-6 instead. This gives you TZFM, both LFO and VCO operation, and quadrature outputs so that you can have synced but phase-different LFO curves. Complex, both as a modulation and audio source. As for the rest of the Intellijel stuff, makes sense to me. Another modulation suggestion might be the Doepfer A-171-2, which is more or less half of a Maths and is derived from the classic Serge VCS...this would give you CVable waveshape/duration from LFO range up into audio and it can also act well as a two-stage EG. Not a bad compliment to a Maths at all.