Welcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
I don't believe that you will have an easy time accomplishing your objective with your current head unit. Virtually all new head units have that capabilities that you are looking for.
Your best bet is to establish a budget for a new head unit, and then go to Crutchfield.com and look at what is available in your budget range. There will also be an adapter (extra cost, but totally worth it) that you can also buy from Crutchfield, so that you can install the new head unit without cutting and soldering individual wires.