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@lae
The problem is that the ENOs and the Dingles are both around the same size (17/19 and 17/21 respectively) - you can't get a 14/16 Dingle and a 20/22 ENO for example. This means you only get a small change between your lowest free gear and your highest fixed gear, which isn't enough for lots of hill climbing.
E.g 40/44 chainset on the 17/19 ENO = highest 69", lowest 57"
Furthermore the biggest ENO is smaller than the biggest Dingle, so your lowest gear will be a fixed gear, which is the opposite of what you want!
With a single freewheel and a single cog, based on the biggest freewheel (22) and the smallest cog (14) and a corresponding double (28/36) you can get a spinny 34" freewheel and a decent 69" fixed, or anything inbetween.