Getting more qdiscs in OpenWrt?

What would it take to get a package that included more of the modern tc qdiscs?

Specifically it'd be great to have:

qfq, drr, sfb, bfifo

I think these used to be in kmod-sched but I don't think that package exists in current OpenWrt? at least it doesn't seem to be available on an 18.x.x series router I have access to.

Is this architecture specific? Is there variation between machines?