What about any form of decentralised trading? Did you look at options: https://coinsutra.com/best-decentralized-exchanges-dex/

Be careful about using some that claim quick on the fly trades such as changelly because they had scam accusations against them in this forum and they use a KYC/AML clause in their ToS so you will have to send your ID to them if they block the trade citing breaches of their terms.