Actually iridebrakeless is incorrect. They only work with ics without modification. It is possible to use them with hic and scs if you cut the top off it.
So if you look at the image there is a welded cap at the top of it, if you cut the top off. You could use it with HIC and SCS.
You don't have to use District Compression, but the bolt is I think 3-4 inches long instead of 8 or 9, a typical ICS. So using typical ICS means a lot of useless turning of a long screw.
you can use a nylock nut screwed onto the ics bolt and run whatever compression you want without mods. and since theres no starnut involved its probably more reliable.