Can I spend from multiple wallets in Electrum (or somehow import/merge them)?

Is it possible, in Electrum, to merge wallets, and or do a transfer using multiple wallet keys? I have some dust in a wallet and would like to get it out. I’m hoping I can easily incorporate it into another payment.

Given the sum of the dust, this is primarily a curiosity. I know it’s possible in the protocol, but wondering whether there’s a high level way, or even a command-line way.