email signup form in Wordpress - choice of lists not supported

My website uses wordpress (ergo NOT a blog on wordpress.org) ...

Per ConCon support info: 

Wordpress.com doesn't support 3rd party Javascript or plugins of any kind

ConCon's advice is to:

we recommend creating a Landing Page Sign-up Form. You can then copy the Landing Page's URL

The FAILURE IS;

Landing pages do not support the user's ability to choose from multiple email list choices -- a Landing Page, by definition is dedicated to a SINGLE list, which is specified in the LP configuration, and not visible or alterable to the subscriber.

So --

if there are more WP websites "out there" than any other single website platform, how am I supposed to put up an opt-in form and give the subscriber a CHOICE of one or more lists?