Hi Matt
You should make a packraft specifically for bikerafting. Have a more durable/thicker material at the bow and stern where you can place your bike. What would be amazing is constructing a 2 person version. Where you have the ability either putting both bikes in the bow or stern for weight distribution and balance.
I’ve also seen little modifications like a sail/kite that can pull your boat on the open waters on a windy day, and a canopy set up to keep the sun off you when your cruising or fishing on flatwater.