Hi Michael, I hope you're doing well!
There's currently no implementation for a Beacon + Connectable peripheral on one device example available, but it could be a possible implementation. First a connection event should have to be triggered, then the device could keep sending non-connectable advertising packets.
For reference, could you please take a look at the BLE Application Developer's Guide, in the following path for the SDK?:
<…\SDK_2.2.2_QN908XCDK\docs\wireless\Bluetooth\Bluetooth Low Energy Application Developers Guide.pdf>
Please let me know if you need any more information.
Take care, best regards,
Sebastian