Kirkland Hearing aid is 8.0 will not pair with Bluetooth

Kirkland 8.0 are MFi hearing aids. They will pair with your iPhone in Accessibility-Hearing Devices. MFi is not classic Bluetooth. Try looking under Settings-Accessibility-Hearing Devices. Your hearing aids can only work with one MFi device at a time. You should not have to unpair them from your iPhone to connect them to your iPad Air a feature called Handoff is made to handle this switching from one device to another but has mixed reviews. If you do not have an iPhone you should have no worries. Try Accessibility and post back. This link might help:

Use Made for iPhone hearing devices - Apple Support

Are you trying to "Pair" with an iPhone or something else? I see your profile shows Windows.