You weren't really clear, because I checked the 9800 datasheet.
But in your case, keeping it off Meraki and using Catalyst Center is a more viable option, in my opinion.
Especially because the C9800 has more features.
And another thing is that I don't see the point in adding a Wi-Fi controller to the Meraki dashboard, since Meraki already has its own Wi-Fi solution. So why spend money on a controller if you can just buy the APs?
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.