thinking initial h2w- -> h- for greek, but e-h2w- at least in prefixes goes to a(w)- with no lengthening, h2w contract a into rounded fricative, this reconciles hestia with aesa and changes aesa into a more normal verb

medial h could either delete or medial hw would voice and merge with w

normal medial cases would likely break but a prefix could preserve the rounded larygeal

you may be able to derive hellenes from a root for rule, h2welh1- , this way

might be able to get rid of alot of "pre greek" words this way