Hello I have just fractured my femur

Hey there, just scrolled through and thought I’d mention my current situation in life… Ha

Well to put it in fewer words… Femur fracture, currently almost 3months non-weight bearing. Knee is real stiff and flexion is around 70° degrees… I was looking into getting an exercise bike to help with the knee ROM, having seat set higher then go lower to achieve more knee ROM as we go along, whilst also progressively rebuilding on the muscles lost from upper & lower leg. Any ideas and/or suggestions from people having been through or similir issues like knee ROM from immobilisation etc… Thank you all in advance…