There are plenty of threads concerning what you are trying to do...you can peruse them to get ideas, but, the upshot of it is that you have to get units (grill and LP fire set) that have the on/off control seperate from the regulator. If you get your units with that feature it is a simple process to remove the regulator and replace it with a quick connect assembly.
I have a Weber Q120 and a Campfire-in-a-Can, both of them modified for quick connects. I also made up a quick connect "T" so that I can run both at the same time and I carry 2x 12', 1x 20' and 3x 4' hoses. Don't throw away the regulators... I converted the regulators to quick connects and now, if I want to use the grill on a picnic away from the campsite, I can quick connect the regulator back on and use a bottle of propane, available at any hardware store or Walmart.
I have regulators, modified for quick connect, that will handle the 1 lb. cans and another that will attach to the larger 20 lb. unit (primarily for if I want to take the Campfire-in-a-Can with us).
And... Yes, I have used a hose run of 32' a couple of times. You won't get as much flame or heat due to line pressure loss, but, for the Campfire-in-a-Can, I don't run it at "full bore" anyway, so, I just have to open the valve a bit more than if I use a shorter run.
My 2 cents, your mileage may vary...
Don
Bronwyn
Down to 1 kitty...J-Lo, the princess
2014 Thor Tuscany 40RX
2015 Jeep Cherokee TrailHawk Towed