Interesting topic, the MS410 doesn't have flexible stacking (you can "convert" a normal port to a stacking port on the MS420 and 425).
But in the end of the day, Meraki dedicated stacking ports (and cables) are simply QSFP's, so I'm wondering if you could buy 4 QSFP modules, attach them to the switches and use fibre to connect them.
We do this on MS425 but there we don't have dedicated stacking ports, we use the QSFP ports and Flexible stacking to use them as stacking ports and this works without any issues (the same scenario, 2 server rooms, single mod due to the distance we have).