Thank you for your swift help, that is great. Sucre is very interesting.
Maybe the CryptoBridge exchange ( https://crypto-bridge.org/ ) could be something for Sucre.
Unfortunately they do charge at least 1 BTC for listing so it seems, but maybe you can work something out and get a discount/trade for SUCR if you ask them.
https://docs.google.com/forms/d/e/1FAIpQLScvq_sKqLGDFtHT8xB_a5yHLVz69ljJ_0Utk8V5Qs_LZVfUBg/viewform