Addressing the first order of business: Digraphs!
Why waste space typing two letters for the sound of one? Isn't that like some kind of anti-ligature?
For those of you who are unaware, Digraphs are what happens when two letters are placed next to eachother, and through the magic of english, combine to make one sound. In otherwords, Ch, Kh, Sh, Th, Zh, Ph, Ng, Ts, Dz.
Ph is already addressed by the letter F, so I'm going to go ahead and ignore it. Kh, Ts, and Dz are pretty well addressed by K, S, and J respectively, so despite the fact that there are more or less significant differences, I'm going to go ahead and ignore them too, especially because of their lack of use in english. As for Zh, I don't even know what the hell kinda sound that makes, I just know it's used somewhere, so I'll ignore it too!
That leaves Ch, Sh, Th, and Ng.
So, what non-vowel uncommon graphemes can the PSP, the cause of all this nonsense display? Ç, Ñ, and the German ligature, ß. Hmm, four sounds, three characters. Well, Ng is pretty different from the other three, so let's first assign Ñ that duty. Unfortunately, I don't feel I can seperate the three out, both because of their similarity and because I want to keep something availiable for when I do non-digraphical consonants. As much as I love the ß, let's go with Ç, seeing as how it actually has a lowercase.
Examples:
This - Çis
Chew - Çew
Sheep - Çeep
Bach - Bak (this makes what I would call a kh-ish sound, though it is not kh)
Chewing - Çewiñ
Photon - Foton
Well, that's about it for Digraphs, join me next random period of time for whatever it is I'll be doing then.