A coil over is 2 parts in one. A shock and a spring. If you just want to use the shock portion, it should work, BUT you still need a spring to support that corner and regular shocks are usually cheaper and smaller.
Their is a mistaken belief that a shock alone supports vehicle weight, it doesn't. A shock's only job is to dampen the up and down motion when hitting a bump.
Adjustable electromagnetic shock absorbers do exist. developed in the racing sector to allow mid-race tuning and tweaking.