No option to remove Bluetooth device in iOS Settings app?

I would like to remove my Raspberry Pi from my iPhone 8 (running iOS 11.2.1) as a connected bluetooth device.

Normally, I would go into my Settings -> Bluetooth and select the Info button (a small blue circled "i") to show the "Disconnect" and "Forget Device" dialogs:

Unfortunately, iOS does not give me this option for my device. The bluetooth device list does not contain an "i" for the item, and there is seemingly no other way to disconnect.

How do I unpair this device if there is no button to trigger to the unpair prompt?

Due to work restrictions I cannot completely reset the device.

Workplaces and schools can prevent bluetooth modifications via an installed configuration profile. Check for the presence of such a profile at Settings > General > Profiles.

Using Apple Configurator 2 (an application made by Apple to allow companies & schools to administrate their employee's/student's devices) there is an option:

Allow Modifying Bluetooth Settings (supervised only)

Unchecking this option in the installed configuration profile will prevent iOS from forgetting the device.

Note: It is the same for Profile Manager in macOS Server

If you are using iOS with an installed configuration profile, I would suggest contacting your IT department and requesting that they allow you to edit Bluetooth settings.

Heres a picture of what it looks like in Apple Configurator 2:

I've experienced this phenomena as well, usually have restoring from a backup, and found that I had to delete the apps associated with the devices in order to make things work properly.

Delete the app associated with the bluetooth device.

This may remove the device from your iOS bluetooth devices list.