Nice initiative
You can take a look at https://www.sweethome3d.online
It a new service that aims at making it easy to embed SweetHome3D in any website and the use case you are describing sounds like a good fit.
There is no Wordpress plugin but since it is simple JavaScript, I believe it should be easy to use it with Wordpress, for instance with the help of this plugin (https://www.ostraining.com/blog/wordpress/custom-js/).
If you are a web developer, more details (and demos) about how to proceed with the integration can be found here: https://github.com/cincheo/sh3do-getting-started.
Cheers,
/Renaud