Hi shelby.gerlach,
I think it is not able to update the home page URL to be the new UX Home page.
The reason is below.
I investigated about PPM Home page.
As you know, CMN_SEC_USERS table has HOME_URL column.
When I update my PPM Home page to Project list page, then this column value becomes to 'mainnav.work&classCode=project'.
The real Project list URL is 'http://<PPM SERVER NAME>/niku/nu#action:mainnav.work&classCode=project'.
So, I assume that PPM seems to use 'http://<PPM SERVER NAME>/niku/nu#action:' as BASE URL.
PPM may construct Home page URL by using "BASE URL" + "HOME_URL" column.
BTW, New UI URL is 'http://<PPM SERVER NAME>/pm'. It is not including above BASE URL.
So, I think that your requirement is too difficult to configure.
Regards,
Shoichi