Are there any light mounting products that is adjustable?
One option for front lights would be to replace them with torches and rubber/velcro mounts such as below, these would be interchangeable and fit pretty much anything - I have even got my iPhone on to one.



As for rear lights you may have to invest in 3 sets of the same light. alternatively in the past I have had to DIY mounts using elastic bands in emergency (not long term solution).



Otherwise consider carrying the lights with you! in the long run it's probably more sensible to have one set that you can keep track of battery wise and condition wise.