When the foot functions as designed there’s no need for an artificial spring. Optimal pronation & supination already provides this unlocking and locking mechanism designed to propulse you forward w/ each step. Unfortunately, years of standing and walking on concrete, with footwear that fails to account for the specific needs of the individual, the arch begins to collapse. For the best result correct the arch with a custom calibrated made-from-scratch foot orthotic, not something mass produced.
Plantar fasciitis - This link provides both information and one of the many products that can be used to wrap the foot to help reduce & relieve foot pain. Taping the foot is another option, as well as wearing HTP heel seats - which can be found on other websites.