Would adding yoga in between my weight/cardio days be too much?

I’ve been on a weight training schedule since the beginning of January after having to give up running due to compartment syndrome in my shins. I work out 3x a week, usually on Mon/Wed/Fri for approximately 2 hours a day. This workout includes about 25 minutes of intensive cardio along with a full body free weight routine that is broken up with 50 sit-ups, 20 step ups, 20 kettle bell swings and 20 hill climbers (and sometimes 20 burpees) in between working my shoulders, legs etc.

I want to include some activity on my off days. I found that when I tried to break my free weights up to cover off 6 days I ended up injuring my abdominal muscle and a thigh muscle. I immediately backed off and kept my weight routine to 3x a week with a rest day in between.

I’m facing surgery in 7 weeks to correct my shins and I’ll be off my feet for 2 weeks or so with a gradual resumption of activity. I’m wanting to be in good shape in the weeks leading up to that surgery but I also just want to max out my fitness as much as I can.

I practised ashtanga yoga for 10 years and eventually stopped out of boredom. I’m wondering if I’m nuts to want to include a yoga routine on my off days? I really don’t want to injure any more muscles.