Download and install the Reaktor PLayer, it's free. Use that, through Reaper, to listen to the .ens files you have. When you're happy with what you're hearing, render the track to audio. From that point on, you won't need Reaktor for that track. Rinse and repeat.
30 minutes, continuous, should be easily enough to decide if the sounds are what you are looking for. I've just tried out a few (Kontour, Polyplex, Monark, The Finger and more...); if you can't find decent sounds in there, take up crochet.
I have maybe a thousand or so Vst synths, mostly free ones, and many have great sounds. One needs patience and a bit of effort to find the right ones, and having a big budget is far from the only criteria (I'm retired; my budget is very slim indeed...). Reaktor 'Spark', for instance, costs 49€ or so, and has a bunch of excellent presets, none of which are 'cheezy'.
As for wanting to compose high-flying stuff, I'd advise starting off modestly and building up over time. No-one comes up with 'Zappa' lines, or prog opera straight off. Get something simple done, then do another, and another. It needn't take decades, but it won't take minutes.
Izotope were offering the Iris 2 for free the other day; similar offers come up regularly.
Here the Viking, for free... VK-1 ...
... and here, Cobalt ...