In the Octamic XTC manual, it is explained more in detail. 3 or 4 samples is not that much.
Converter latencies of today's devices are also becoming lower.
Yes, I would choose the new M32 Pro II and would use MADI optical.
You could also think about getting the HDSPe MADI FX with three MADI buses.
Then you could connect a pair of AD and DA converters to one bus.
This would even allow recording in double speed (where you only have 32channels per MADI bus).
MADI Bus #1: ------>------ M32 Pro AD ------>----- M32 Pro DA+
+---------------------------------<---------------------------------------+
MADI Bus #2: ------>------ M32 Pro AD ------>----- M32 Pro DA+
+---------------------------------<---------------------------------------+
MADI Bus #3: ------>------ 12Mic------+
+---------------------------------<---------+
or
MADI Bus #3: ------>------ UFX+------+ For e.g. DURec Purposes as recording backup
+---------------------------------<---------+
AES:-----------ADI-2 Pro FS R BE or ADI-2/4 Pro SE--------------------Monitors/Phones
HDSPe MADI FX MADI BUS #3 is coaxial, but you can buy an optional optical card to be connected by ribbon band.
HDSPe has AES I/O, so you can connect easily ADI-2 Pro * for monitoring.
Special with this card is the optimized driver which only allocates computer resources in the driver for groups of 8 ports, if at least one port of the 8 is in use, otherwise not.
Just a few ideas.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub14