Molly can also work along with Signal, if you don’t want to loose any history in your primary insall, you can still install Molly on your secondary device and link it to Signal

the two can co-exist as well… you can keep your Signal install on your primary device and you can install Molly on a tablet, and have it linked to your Signal app as a linked device. this way there’s no loss of data on your primary device

this is the way