I'm very sorry to hear about the recurrence. It is the thing we all fear the most. As to the port, there is general considerations to not do too much physical stressing of the upper body to avoid potential damage to the port. Since I am right handed and did want to as able as possible, the surgeon placed the port on the left side so that would minimize stressing the port.

If you get a PEG and port, I'd be very surprised if the docs allowed you do continue doing any physical contact sports until the devices are removed and you were fully healed. It just seems the risks from dislodging a port or PEG are pretty great.
Don