No need for workarounds. Only the flagship nitter.net was blocked. Nitter is an open source project and maintains a list of working instances on its wiki: https://github.com/zedeus/nitter/wiki/Instances
I’m not sure how Twitter ultimately blocked them. It would be pretty embarassing (for Twitter) if it were a simple IP block of the Nitter.net servers, but that doesn’t seem too out of whack with Musk’s history of litigating bot behavior…