Do the sprints on a ski machine, rowing machine, or stationary bicycle.
Non-impact is key, unless running on grass.
You are exactly right that using those types of equipment reduce injury in the medium term….BUT the reason I want to minimize their use and do things that require a bit more athleticism is that eventually (38 years from now) I will be 90 years old and i will need to be athletic enough to avoid fracturing my hip because i trip on some stairs.
When I do athletic stuff I try not to do it in fatigued state, like with HIIT, because of the injury risk.
Exercise is fascinating though….i find myself getting obsessed with it in my 50s.