[nicoburns]

kyube or kyoob would definitely be the way to go.

It's funny you use "tube" as an example though, as in my British accent I pronounce that as "chube", whereas I believe many Americans would use a "t" sound for that word. Not sure how you settle on a spelling in those cases.

[normie3000]

Regional variations are available! I think the BBC would have had it pronounced tyoob. And don't Americans pronounce it "subway"?

[xyzzy3000]

In the north of England it is still commonly 'tyoob'.

[mcny]

Most Americans sadly never get to ride one anyway.

[smegger001]

No but they do eat at them.