I tried in the past using the same trick with not setting a page type and then using a group to pull in page parameters. The trouble is this wont work for the SEO title and description. Unfortunately it will limit you to either the current user or app text - both I believe wont be able to pull in data from a types thing.
Here is a post where the concepts are further discussed:
If there is a workaround without setting the page type that would be great. I’d prefer sometimes not to set the page type as its a cleaner URL (just a visual thing really, no impact as such for SEO) and I’ve gotten a slightly faster page load, very minor, but still every little helps.