Currently, UURollup is depreciated. People recommend that blackwingcat's Extended Kernel and Extended Core are used instead. However, you can't slipstream them. What's the alternative?

I'd recommend just grabbing one of the recent HF_SLIP packages from tomasz86's website and making an ISO of it and then just installing blackwingcat's patches over it after reinstallation, that's how I do it when I reinstall Windows 2000. It's not that much of a process afterwards. But there seems to be a bug unless it was fixed in some of the recent Extended Core releases so if you use dual monitors, it will not function and you'll only be able to utilize one monitor, I think the problem starts with v16a?

UURollup can only be slipstreamed because I manually tweaked the hell out of the installer specifically for HFSLIP . The BlackWingCat's kernel is not prepared like that, so direct slipstreaming is impossible. You should still be able to install it silently in T-13 (svcpack) but only after repacking the installer to the standard M$ format. I am not sure the effort is really worth it.