The Digitalis is nice. But think about the sequencer section of a micro Ornaments & Crime. It's 8HP and will give you four channels of sequencing... plus a BOAT LOAD of other options... like quantizing, LFOs, etc. The savings is 2HP in space. It will play nicely with the Pam's New Workout.
I would find something else besides the Timiszoara. There are even smaller multi-effects modules out there that are slimmer. The Expert Sleepers Disting EX is 8 HP and will do a LOT more than just effects and it's a DUAL UNIT also. That will save you another 2HP
Twiigs is fine. It's 8HP. But if you go with the original Mutable Instruments Branches, it's 6HP. Hey, another savings of 2HP.
The Doepfer A-139-2 is 6HP. It's ONLY a headphone amp. Noise Engineering's Sono Abitus is 4HP and comes with BALANCED 1/4" outputs PLUS a headphone amp. You save another 2HP
If you take those four suggestions, you now have 8HP of space available.
With that 8HP you might consider an audio mixer module or replacing Sono Abitus with a mixer with headphones out. A small filter would be nice in addition to the mixer and some utilities (attenuverter, noise, etc.)