I'm thinking a flexible silicone hose
Usually the manufacturers of silicone hose say its not suitable for use with oil. Material compatibility charts confirm this - but that doesn't reconcile against felpro silicone rubber gaskets or silicone gasket maker.
Something to consider. It'd still probably last quite a while.
I like your tucked concept and it'd certainly look clean, but you'll need to make some tight bends that'll inhibit flow to some extent. Also, hiding your catch can under the intake manifold will probably make emptying or servicing it more cumbersome. More things to think about.
I considered a fancier arrangement than what I ended up actually putting together, but ultimately chose what I deemed to be function over form. It consists of joining the two valve covers with a ⁵/₈" hose, and then a 1" hose exiting the baffled zone of the exhaust cam cover; going straight to my catchcan mounted where the battery used to live. Haven't tested it yet, though.