iOS Background audio recording

Question

I know that if I start an audio recording session in foreground, with Audio, Airplay, and Picture in Picture activated in Capabilities -> Background Modes; I am able to continue to record even in background, but only if I start the recording session in foreground and then I go in background.

My problem is that I want to start the voice recording session from background, which might seem shaddy and not what Apple wants, but the use case is like this:

I have a Bluetooth LE device with buttons and an iOS app. Those two are paired (Bluetooth LE device and the iPhone which runs the iOS app) and the iOS app is listening for events on the Bluetooth LE device, events like a hit of a button.

Now, when the user hits a button on the Bluetooth LE device, the iOS app captures the event and I am able to run code even if the app is in background, but I am not able to start a voice recording.

My question is: is that even possible? To start a voice recording from background? Even if we have user interaction here, not on the iOS app but on the Bluetooth LE, so it's not like the voice recording starts in background and the user is not aware of it, he pressed the button on the Bluetooth LE device, he knows what he's doing.

Any help, documentation, tweet of an Apple engineer, anything would be much appreciated. Thanks.

UPDATE: MFI is not required. https://mfi.apple.com/MFiWeb/getFAQ.action#1-2.

If you look into the section:

"What types of accessories and technologies are NOT part of the MFi Program?"

You will see that:

"Accessories that use only Bluetooth Low Energy (BTLE) (note: BTLE-enabled HomeKit accessories and BTLE-enabled MFi Hearing Aids are part of the MFi Program)"

Is mentioned, which means MFI in this case is not required.