Maybe someone could correct me if I'm wrong here, but as far as I know the wallet uses bip39 for generating the seedphrase, meaning it should not be difficult to recover this on Electrum. Or you could simply use Bitpay wallet as explained in their github repository.
You are right, any bip39 mnemonic compatible wallet will work, I have used Copay in the past as well and the recovery seed works in Bitpay wallet, they work in similar manner.
Download Bitpay
Go to add wallet and import wallet
This should work on every Bitcoin wallets that supports bip39 like Electrum, Blue wallet even Trust wallet, which I don't recommend anyway but just listing wallets that are bip39 compatible.