I've been using some very expired Polycontrast SW I got on ebay which is surprisingly less fogged than I could have believed. A fair bit of Benzotriazole in the developer and you might be OK. Perhaps worth a try.
I've been using a test run of MCC for my proofsheets for many years, I got a huge number of 50 sheet boxes of 9.5x12" paper from Mirko when he first did the MCC coatings. I'm of an age where all proofsheets were made on SW paper, and I must admit I do vastly prefer editing them now than when I was stuck using RC.
The fog is there on the paper from the batch I have, but is nothing that benzotriazole and a 90 second max devoloping time can't handle. Lovely stuff. Been running it in Neutol NE lately, a great combination.
It is possible to get very lightweight gelatin-silver photographs by starting with resin coat paper and doing "emulsion stripping". Split the RC photograph starting at a corner and peel the image straight off the base. With care and practice even up to 8x10 can be done but difficulties increase steeply with size.
if you don't mind coating your own
you can coat your own sheets of thin paper
using home made or bottled emulsions. i regularly
use thin "butcher paper" as a single weight substrate
and make paper negatives and contact prints and sun/retina prints with it.
it takes practice getting a good coat and getting used to the emulsion ...
Wephota in Germany sell's graded single wight paper, should be similar to the old Orwo paper.
Look for "Universal B / Papierstark 1" in their pricelist. http://www.wephota.de/down/wephota/wepr.pdf
I got couple of beta ware boxes from fotoimpex as well - with stronger concentrate of developer and some neutralizer from Moersch - no fogging at all. It is super cheap - I will get some more soon while it is there