I think a couple of hints on how the words are pronounced might be helpful. I have no idea what Łíí would sound like. Does it sound like a Polish Ł? Do the accents on the i's denote a rising tone? Is Navajo a tonal language at all?
The struck "L" is pronounced like Welsh "ll". The hooks on the vowels represent nasalization. High tone on both vowels and a glottal stop at the end.
Navajo has high and low tone, rising and falling on long vowels.