Will Borgen and Andrew Peeke are guys I like but a reach as a 2nd pair guy. Rasmus Andersson is a reach as far as availability and cost. Matt Roy is IMO the best option for what Buffalo needs, possible availability, and trade cost. I don't know about #13 for him, but I would be ready to work out a wide range of trade packages for him.
I think it depends less on what Buffalo can offer, and more about if LA can afford to trade him. I know they prefer to trade Durzi or Walker first, but maybe Clarke is ready to step up and allow LA to part ways with Roy.