Extracting info from Entities

I am trying to look up data of entities, but I imagine I’m not doing it right, or have misunderstood the structure.

Here, I try the extract the values of the new SI defining constants, which are embedded deeply in the structure of the Entity[“PhysicalConstants”]. However, the structure is not real Associations, so you can “index” your way to the information, but I had to use Lookup. Also, not all entities in the list have the property/value I look for, so some filtering is necessary.

My best try is

siconstants = {#[[1]], Lookup[#[[2]], "Value"]} & 
/@ Cases[{#, Lookup[EntityValue[#, "Values"], "CODATA2017RecommendedRevisedSI"] } & 
/@ EntityList["PhysicalConstant"], {_, _List}]

but there must be a simpler and more correct way(?)