Please do this before going to the significant effort replacing the RMS requires.
I'm guessing your engine has been living on a synthetic engine oil. It's not uncommon for our engines to develop RMS leaks with many synthetic oils. It happened to my BMW too. If that's true, try this....
Change your engine oil out for a CONVENTIONAL High Mileage 10W-30. High Mileage conventionals are not always easy to find but it's worth the effort. NAPA sells a 10W-30 High Mileage that is a conventional. High Mileage engine oils contain additional seal restorative components that will often cure (not plug) a RMS leak.
My BMW developed a really bad RMS leak and the local German shops were quoting pretty close to $2k to repair it. A bunch of BMW owners in various BMW forums suggested switching to a high mileage conventional and damned if it didn't cure the leak in 5-6 days of daily driving. Good thing too, I was getting sick and tired of cleaning the big mess up off my garage floor.
I've never had a RMS leak in my TJ after 26 years of ownership. I've never run a synthetic engine oil in it either.