It can be done fairly easily.
I mounted an alpine head unit in the boot (trunk) then fitted a mc-2 remote controller on the dashboard.
Also fitted a 3.5mm audio jack on the rear bulkhead for headphones (earbuds) with a headphone booster.
I have live sidepipes so it serves 2 purposes when required.
Alpine MC2 Add-On Wireless Remote Commander (MC-2) at Onlinecarstereo.com
The MC-2 is waterproof as it’s meant for a boats fly bridge.
I painted the face black so it blended with my gauges.
Hope that helps..
Cheers