Yeah you pass the transaction from Cake wallet to cupcake, it makes the signature, then scan the signed tx back into Cake for broadcasting. Anonero used to do this too but I don't think its being developed anymore. It's fine *as long as you don't mind storing your private key on a phone*

I've haven't used Cupcake yet tbh. My understanding is that it's a watch only wallet. Do you want a signing device or just cold storage? If you just want cold storage you could roll a key, load it into cupcake and just have it generate addresses you send to. But I don't think you can use it to sp...

The only better way I can think of to do this is: derive the seed (use coins or dice if you prefer) and record into steel, load it up into an isolated environment (phone or VM) and derive the #monero view and public spend keys, export those to the device you want to use and make the view-only wallet...

Sportballs