You won't be able to install Mojave (the machine won't be on the list of machines that Mojave will install to). You may be able to boot a Mojave clone if Mojave contains the drivers needed for the hardware in your machine. For example, my 2012 Mac Pro won't install Snow Leopard but it will run a Snow Leopard clone. The T2/Secure Enclave stuff could potentially brick things with updates...I would be very nervous to try this and would definitely turn the security to the lowest levels and allow USB booting.