I have not tried this, but I feel it might be a bit of a hassle to install, configure, subscribe to a paid external service, manage the account to suggest to “just use” this plugin 
I’d try to tweak Discourse spam settings and thresholds first : https://meta.discourse.org/t/tips-for-preventing-spam/264020#p-1285092-spam-related-site-settings-5
Then, also install the Akismet plugin. You can obtain a free key very easily by just registering an account: https://meta.discourse.org/t/tips-for-preventing-spam/264020#p-1285092-akismet-anti-spam-plugin-3
My forum has a lot of spam (most from India as well), but the vast majority is caught either by Akismet, or by the Min first post typing time setting.