I doubt that you will be able to carve out polygyny from polyamory, so I don’t see much hope there.
It's not that simple. Issue is polyamory crowd is divided into multiple incompatible groups under same label.
Same can be seen in watching infighting inside Libertartian party of USA between it's left wing (hedonistic, LQBT positive, no rule/hierachy) and right wing (pro-family, pro hierarchy, LQBT negative). People from opposite wings, despite being in same party, can't imagine living in same community.
There is swinger group with whom we have nothing in common. But these is also polyfidelity group where people do have committed relationships. No sex with people outside group, just like us. They are pro-family group in practice. Only key difference would be accepting of multiple men inside relationship.
There is nothing to learn from swingers except possible "ways of better sex". But polyfidelity group can be source of wisdom for us. They do have same problems as any poly family here. Vetting new members, how to divide household work, living together with multiple people, dealing with family (parents, siblings), social acceptance issues etc, communication......