One suggestion I made when we were batting this idea around on our non-binary forum is to (for example) set up the magazine as a wordpress blog with multiple editors. This is an easy (and free) way to start with an already professional-looking layout, and unless/until it grew huge, wordpress hosting is free, so the only outlay would be time spent writing for it and maintaining it (and responding to interaction from the punters).
So it could start as a simple collection of articles, added as and when they appear - which would be a lot more flexible than trying to produce a regular issue to a deadline. Once people know about it, they just Follow it, and then every time something new is published, they'll be notified. We could (heh, "we" - yes, I'd like to get involved in this) still have themed "issues" by having several people write about related subjects and then publish them to the blog at the same time, and you can collect articles to a separate page so people can find them easily, and and - like I say, it's a pretty flexible format.
Also, being entirely separate from any other setup or forum means we get to decide our own ground rules and TOS, and not be worrying about treading on anyone else's toes (or being constrained by anyone else's house rules).
I'd be very happy to devote some time to pulling this together, if people are genuinely interested in making it happen.