I would have thought a call to ML ATC would deliver a result. Whenever I've rung to ask advice or what their preferred procedure is, they have been excellent. BLT to EN @A055 cuts through a bunch of approach paths. There may be another route / altitude or time of day that gets you CTA experience without stressing the system. If all you want is CTA experience you can just glance down a "dead" edge of the CTA.