A Berlo on a triangle track and only one input is the same amarms as building your own Berlo (which needs both inputs), assuming you put your glyphs or inputs on all the spaces it would cover. But building your own comes with a few extra advantages that are useful for secondary cycles: since you never need to pull the second input after building the Berlo, it frees up the usage of other glyphs, making it easier to transfer the products to their outputs.

Not to mention that you get two additional spaces in the custom Berlo--you could even use it to grab the output!