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Some of those letters are part of digraphs, so it doesn't make sense to say that they're pronounced a certain way. (Even if you prefer an analysis without digraphs, the "e" and "y" still aren't pronounced, and none of the example words as far as I know have possible pronunciatio...

In one of Leslie Charteris's Saint books from the 1930s, he spelled out BEPPO: 'B for Bdellium, E for Eiderdown, P for Psychology, P for Ptarmigan, O for a muse of fire that would ascend the brightest heaven of invention!'