There’s no problem splitting the 75-ft. run. You do know, however, that technically it won’t be an independent zone? It’s just Zone 2 in two different locations.
Regards,
Wayne A. Pflughaupt
“Cheap Craigslist receiver” or not, the ability to use 4 speakers will depend on the particular receiver. If all else fails you can always use a so-called speaker selector switch.
Regards,
Wayne A. Pflughaupt