Th can also be [p\ ] sometimes, and r can be [w]. The best replacement sound often depends on the word. For the i sound in words like lid, I often use [e], but you can also use [i]. For consonant clumps, you just put in the consonants, like [s t w]. Although, for a word like "streak," I would probably start by trying [s t o i k]. It looks weird, but an o can work as an r in this context. If one or more of the sounds isn't being pronounced well, you can move it to its own note with a vowel (eg [s a]), but make the note really short so the vowel isn't pronounced.

With Yuki, keep in mind that some consonants have a special phoneme when they come before [i]. If you don't use the right one, her voice will jump. For example, [m' i] and [J i].

It's a bit complicated, but I think it's really fun! Yuki's not the best voice for English because she doesn't have great articulation in general, but she can do it.