I had a look at Conveyor already and it looks very interesting but it is only free for open source software and not, like in my case, for all non-commercial software. I give my software binaries away for free but I cannot make it fully open source at the moment.
The Mac native toolchain shouldn’t be the main problem because I am on an (Intel) Mac and I just want to build for ARM Macs there. AFAIK the toolchain supports that.