This is nothing new. Don't you think if demand was there that some outfit would already be making rubber?I am with the OP, there are enough GC 1 &2 , Anny's and Centennials out there to make a custom cushion. I understand not making cushions for every old table. The OP was pretty specific and so am I above. I get calls all the time. It would be far more cost effective for the client. Yes, I am researching having the cushions produced.
TFT