Paleo-European *abVl- 'apple' (updated)

Several IE languages of North Europe (Celtic, Germanic, Balto-Slavic) reflect a lexeme *abVl- 'apple' which is regarded as a Paleo-European substrate loanword by some specialists¹. In my opinion, a likely cognate would be Hittite sam(a)lu- 'apple (tree)', with denasalization of m and loss of the initial sibilant², which in this and other words such as sākuwa- 'eye' < IE *H₃ekʷ- 'to see' and sankuwāi- 'nail; a unit of linear measure' < IE *H₃n(o)gh- 'nail' would reflect a labialized voiced pharyngeal fricative *ʕʷ (IE *H₃) .

Therefore, I'd reconstruct a Nostratic³ Wanderwort *ʕu-malV also reflected in Basque udare, udari, madari 'pear'⁴ (with denasalization and further delabialization), and which I'd link to Nakh-Daghestanian *mhalV- ~ *mhanV- 'warm', with a straightforward semantic drift from 'warm (season)' to 'fruit'. This makes sense because the apple tree is originary of Kurdistan, precisely in the area where Nostratic was presumably spoken.
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¹ For example, Theo Vennemann links it to Afrasian *ʔa-bul- 'male genitals', which (in his own words) is "semantically unsatisfactory although phonetically perfect". See T. Vennemann (1998): Andromeda and the Apples of the Hesperides, in Europa Vasconica, Europa Semitica, p. 591-652.
² Explained by ortodox IE-ists such as Kloekhorst as the result of a "s-mobile".

³ My own concept of "Nostratic" isn't the one of a very large macro-family including IE, Uralic, Altaic, Kartvelian, etc. but a language spoken in the Taurus-Zagros mountains, where several species of plants and animals were domesticated in the Neolithic.
⁴ A variant *ʕu-manV would be the origin of Basque umao (B), umo 'ripe, seasoned' and Uralic *omena ~ *omVrV 'apple'.