Have been using a duo hw.1 setup (one as a backup) for well over a year and find it an excellent and inexpensive hw solution especially when used with a smartphone as a second factor for improved convenience when spending. Have started looking into using copay and their multi sig support which also supports ledger hw.1/nano as a co-signer. The question I have is can I continue to use my hw.1 as a dedicated hardware wallet, as well as, have it function as a co-signer for the copay wallet? Or does this require or on security grounds a separate ledger hw?