In Illunse, pronounce oe as oi in oil. This pronunciation follows Latin.
In Illunse, pronounce eu as in feud. This is approximately the same as the Latin pronunciation of eu.
In Illunse, pronounce eo as in...Beowulf, that's as in the Anglo-Saxon epic poem. Pronounce it like ay + oh (short o). That's like éo in Old English which is a diphthong. This is not a Modern English vowel.
I may later alter some existing words for pronunciation.