Sorry for the late reply.
As for downriggers it looks like you would have 2 options. They do make a mount that would mount to the rails that are already on the boat. I wouldn’t have any concern with the rails being able to handle the weight its more of the bracket spinning on the rail that would concern me. Second option would be to mount a small track (6″) right behind the rails near the step pads and mount them to that. Would be removable other than the small track itself.
As for a kicker. I don’t think that can be easily done without a lot of modifications and custom mounting. I would maybe look into upgrading the bow trolling motor to a 36v or adding an engine mounted trolling motor. That would be the best options I could come up with.