I looked for ways to get inputs really slowly, so that I wouldn't have too much work to do per tape loop.

I looked for ways to turn 28 atom bricks into 7 quintessence.

Finding both, I built a thing.  Every 42 tape loops it will grab 2 inputs and make a 14 atom chunk from them.  This chunk can be appended to itself to make a dense sheet 7 atoms wide.  Originally, I broke off 4 rows at a time with a transport arm and did all the glyph touchups that way, before passing it into the unification feeder.  But with a lot of effort, I was able to find a very precise arrangement of glyphs that made it just barely possible to hook up the unification feeder directly to the sheet.

42 tape loops is a perfect number, because it takes 6 tape loops for the unification feeder to consume one column of sheet.  This is twice as fast as was needed in the world where there was a transport arm.  But it is exactly the rate needed if the sheet is extending by 2 rows every 42 tape loops.  It clears the area not a moment too soon.

I like that bulk transmutation is a bricking puzzle.