SPD's are not nice to knees that need more rotational float.
Speedplay Light action worked great for me. Lotsa float, but non-SPD cleat.

Then I discovered MKS Touring pedals with MKS Deep Toe clips (no straps), and I ain't lookin' back.
I can wear any shoe, and no more knee probs, and only about 60$ for the whole setup.
No pedal strike either. Doesn't slow me down and I can still pull up even though I don't use the straps. The clips hold my foot right on the pedal so it doesn't come off.