Maybe cloth, either a thin linen or cotton might work? Used wovens from the thrift store? maybe even cotton sheets?
I'm thinking (because I'm in the middle of an abstract, handsewn, strip woven dye
project) that if the ink was some really good india ink, the cloth might have some interesting graphics by the time it was thoroughly used and could continue life in a pieced something or other...maybe as a patch?
I'm thinking of how absorbent my linen kitchen towels are...and how absorbent worn cotton knit t-shirts are...and cotton bed sheets.
How does the blotter paper attach to the wooden thingy?
I did see where the best blotter paper is cotton, linen or hemp.
I've noticed when I'm brushing india ink onto cotton or linen cloth it bleeds around the edges unless I size the cloth with soy
milk first.
I think though, unless the ink has a drying additive, it won't dry instantly on any sort of blotter?