Mechinstaller works best with xbeboot, so if a signed xbeboot works with Stardust, then this will be a solution. Since there is not much that can be customised with xbeboot, I see no reason to ever need a new version so once I have a signed xbeboot, it should last forever.

Apparently I had misinterpreted Ed when he said "Because ShALLaX is not willing to give us the source of his xbe.", what he meant was that I refused to accept him signing the XBE.

I think we can finally put this all behind us.