I have done this before but it required temporarily using a second device. When Molly shares the QR code to link to another device, take a photo of that with another phone or tablet, then quickly swap profiles, then scan the photo you took of the QR code on the second device.
It took me a few tries to do this. I had to have Molly already active and open to the right screen in both profiles so I could switch quickly enough before the QR code expired. Wish I knew a better way.