What scale does you site operate in terms of QPS?
However, my main goal for Marmot was to decrease the latency of my website by putting the db as close as I can to the end user
It's about +5M requests per day or ~2B per year. That's on the lower end! The higher end is ~20B requests per year!
I think using distributed SQL for that kind of scale may not be a wise choice, but that's my opinion...