Would love to see more oscillator designs out there but you could also look at Gieskes’ 3trins. While it’s a capable video instrument by itself, you can also get 3 flexible VCOs out of it if you use the expander board to make its RGB outputs LZX compliant. You can rack it if you flip it sideways.
The expander board was out of stock for awhile but it looks like someone traced out the original and you can order them in 3x batches via OshPark. Find two other folks on the forum who want a board and you’re set!