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I would like to hear some ideas that can explain Greek *σκέπτομαι, σκοπός "watcher, look-out, spy, mark, goal"
from Proto-Indo-European *skep-ye-, from a metathesis of *speḱ-.
Cognate to Latin speciō (“I see”).
... especially the methatesis.
German schauen "to watch", En. "to show" are PGmc *skawwōną (“to look, see”), IE *(s)kewh₁-(“to heed, look, feel, take note of”). *(s)kewh₁- could conceivably relate to *h2ew- (Def. 2 "to perceive"). Could these have, for example, influenced the metathesis?
Quite possibly!
There was definitely a Proto-Greek form *skow-os < *sk-o-wh₁-os meaning something like "watching" or "overseeing"; it didn't survive on its own, but is attested in compounds like thyo-sko(w)ós "haruspex" (+ thy- "sacrifice").
When you have *skow-os "watching" next to *spok-os "watcher", a transformation into skop-os isn't at all implausible. This then spread to other forms of the same root, giving skep-sis, skop-éō, and so on.
