You can always release the game with some generic art and offer the copyrighted assets in a shop. With some luck the game becomes popular and people add further assets to your shop. Demand some commission and you may have created a cash cow.
I'm running a Irix 6.2 desktop on my PC right now.
Also fun fact: up to version 6 of the MIPS port of NetBSD, you could run Irix binaries. I'm pretty sure it can boot in qemu-mips which would be another avenue for some ability to run certain Irix software on PC.
I’m sure I’m not the only one (though the number is vanishingly small). It’s difficult to know how large the community is without nekochan.
Hope springs eternal. :)