Changing activity for Monthly Challenge

I have a nice streak of meeting 14 consecutive Monthly Challenges in my Fitness App. Unfortunately, my "reward" for recording a few Open Water Swims while on vacation in Hawaii in December was to be challenged to complete 7 Pool Swim workouts in January. I don't have ready access to a pool and don't want to risk hypothermia with an open water swim now that I'm back home. ;-)

I recognize that I'm probably just venting here, but it would be nice to be able to request/set an alternative challenge of equal intensity based on my other fitness history (running, walking, elliptical, etc.). Has anyone had success with this?