Yes, we have done that, you can use one more WordPress installation as a single sign-on server. E.g. For us, We have https://publicityport.com (WordPress) https://softwaretestingboard.com (WordPress MultiSite) https://softwaretestingboard.com/qna (Question2Answer) https://digitalmarketing.q2a.io (Question2Answer) All four site can connect to one common server, https://myaccount.publicityport.com to get the user authorized. So, users do not really have to create a separate account for all sites. For, WordPress you can create a single sign-on client. And for Q2A, you can use the plugin, https://github.com/PublicityPort/q2a-publicityport-login
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July 15, 2020: Q2A 1.8.5 released!