Second owner with hardware wallet

I am trying to increase pledge to my pool with a second owner. They use Yoroi mostly. How can I secure sign a pool certificate with them keeping their Cardano in their wallet.

I know one method is with ADALITE where you goto the advance tab and download the CBORHEX value and I think you make a stake.skey out of that some how. And then you send the pool certificate to them to sign.

Is there any methods with YOROI or DAELADUS?