I took it upon myself to work with y as my only vowel. And now I know why Bök didn’t add it to the book…
Why fly by dry hymns?
Shyly, pygmy pry rhythm.
Ympt syzygy slyly synchs sylphs.
Scry psychs my myths, nymphs, gypsy by hyp.
Ply crpyts wryly, spryly.