well that certainly changes things! HIIT and crossfit may be too much for your leg. how about doing a total body workout 3x per week going fairly light on squats. a total body workout would consist of :
squats
bench
pullups (assisted)
deadlifts
clean and press
do 4 sets of 10 reps monday, wednesday, and friday. here's the catch(es).
1 - no carbs post workout for as long as possible
2 - when you break down, do complex carbs only
3 - do these exercises as supersets, and focus on speed rather than weight
this is not to say do bench press with the bar. it should still challenge you, but you should always be able to hit rep 10. this workout will peak your growth hormone levels - which will stay spiked for up to 24 hours, but will return to baseline with simple carb intake. the goal is to do all 4 sets of 5 exercises in 25 minutes or less.
having high growth hormone levels will help you chew through fat, and being the 2nd best muscle builder will preserve a good portion of the muscle that you do have (remember your body will try to ditch muscle first). between that and swimming on tuesday/thursday and whenever else you want to, you should see a difference within a month - 2 inches off your waist at least. i'll guarantee that, if you can limit your post-workout-till-bed carbs
EDIT : i've had two friends do this type of workout, and one lost 2 dress sizes in a month, the other lost 2.25 inches off his waist. the girl had much better carb control than the guy. the guy kept going to charbucks after the workout
