The M3 Simply uses a microSD card that you can freely edit in nearly all operating systems. The only thing that might be a problem would be if you want to try to upgrade Moonshell to the latest version, as Moonshell uses a setup.exe installation program. However, the one bundled in the M3 Simply firmware will work fine.
On a related note though, you won't be able to convert your own videos to DPG format for viewing in Moonshell, as the only two converters are for Windows only. I think there is a Linux python script on GBAdev somewhere, but I don't know if it will work on Macs or not.
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