I found what I feel is an excellent possible option for the GCF elements: Viva! paper towels by Kleenex.
This media is flat, not pleated or "quilted" like most paper towel rolls. It is like a very thick toilet paper, so it should work well. Unlike quilted/pleated paper towels, the oil will need to travel through the media, not between the sheets.
The only downside I found is that it takes two rolls to make a single element (meaning you need to roll them together, which is time consuming).
This media is flat, not pleated or "quilted" like most paper towel rolls. It is like a very thick toilet paper, so it should work well. Unlike quilted/pleated paper towels, the oil will need to travel through the media, not between the sheets.
The only downside I found is that it takes two rolls to make a single element (meaning you need to roll them together, which is time consuming).