I’d go for LV from Monday to Friday complementing those 3 trainings that are mostly on threshold or higher zones with one large endurance and tempo ride outdoors on the weekend. Thar way you cover it all as it is covered by the MV plan. And 4 rides a week isn’t that much. I do 5 rides a week 2 outdoors on Saturday and sunday and I have a tight scheduled and a really bad recovery system (sleep no more than 6h a nigh in average) and I’m coping with it. If you can’t handle it you may swap the 3rd TR LV session by the outdoor ride instead of making that outdoor ride an extra training, but to start with I’d give it a try for sure.