I think "Client Code of Conduct" given below prohibits me performing your request.
----- What is required of LogoTourmanet clients: We require that you do not ask one designer to use elements or concepts from another Designer. The general rule is that, if a Designer was the first to submit the idea, they essentially own that concept or idea for the remainder of the contest. Requests or ideas you have put in your contest Brief are fair game and open to everyone. Concepts that are considered obvious will also be fair game, for example: a dog & cat for a pet hospital, shopping bag for an e-commerce company, a tooth for a dentist, initials for a lawyer, etc. ----- Link: https://logotournament.com/help/clientcodeofconduct
However, taken the fact that the mountain concept was given in your brief into consideration I can do another type of mountain which is not based on his design.