You might be overthinking this a bit - but I appreciate your attention to detail!
I guess my original thought was along the lines of "should I get a set of skates that would make it easy to do all the turns, stops and freestyle stuff (and get a feel for using all the edges in different situations) or just blast down the trail at a high rate of speed on 3 big wheels. And which would ultimately enhance my snow time the best?
I am but a simple man...
That was my point above with the 'every stride is a turn' comment - it's very simple indeed -
all of them will enhance snow time if one puts in enough time and refinement into one's basic skating stride. Every skate stride has the components of a ski turn. No slalom gates needed. You can do cone work but you don't have to. You can do park work for fun, but that's on top of working on basic stride.
Taking your basic stride - the motion you will be using at 40-70 strokes per minute for approximately every moment you are on skates- to level 3 and beyond into regimes like crossovers in a straight line - is where the returns on skate-to-ski truly lie. And every properly fitting skate can do that for you.
At least half the current topics in the Ski Instruction forum, from the Outside edge-to-Outside edge drill to Pinky leads the way to all the debate on skating downhill - have direct analogs in skating, and the answers are either intuitively apparent or available as super clean Youtube drills from guys like Pascal Briand.
There is a dark side. If you
don't work on your skate stride to get to that point, if you just go up the trail and back, every stride you make will be ingraining heel-pushing, ingraining A-frame balance, and ingraining uncontrolled upper body mannerisms. And no amount of park work, no amount of cone work can correct that.