>>(K-F drives in UF-verse, I'd imagine, would be regarded as quaint
>>things that only the most desperate or most eccentric would bother
>>with.
>
>I'm not sure the principle behind the K-F drive works in the UF
>universe, but even if it does, I suspect it would be one of those
>technological dead ends that nobody ever did anything with. Like,
>every civilization that ever invented it looked at the math and went,
>"No, fuck that, we're not building that" and waited for someone to
>come up with the hyperspace motivator. :)

There is a fanfic that crosses BT with the Kerbal Space Programme

And the Kerbals think BT fusion engines are freakish, never mind the K-F Drive. BT advanced physics are apparently rather out there when it comes to fusion reactors and the extension that led to their hyperspace use.