WP discourse - One wordpress multiple discourse instances

Has anything else materialized from this discussion?

I run Discourse forums on my ecommerce site (for regular customers), but I’m starting a premium program soon, and I’d like to provide forums for only those users.

Based on this discussion, I’m not seeing a realistic way for me to do this with one WP installation and 2 Discourse instances.

This setup is preferable to an entirely new domain for a slew of reasons—cost, hassle, branding, and I already have a sizable audience on the existing domain.

Any ideas for how I might be able to tackle this?