UV lighting is a very simple job, install the bulb array in the air handler ideally before and after the evaporator. The older models stayed on 24/7 but now they have designs configured to switch on if air flow is detected or if current is detected on by the motor. An added benefit of the UV system is mold, algae and bacteria won’t propagate on the damp evaporator during summer months. Make sure the bulb frequency rating is high enough to be effective for destroying virus, I will have to recall that factor.
The reverse polarity ionization technologies being pushed right now for air purification to my knowledge have not had very many compelling results. I would stay away from that cost fir now. If you are in a smaller space a portable HEPA cart with MERV 17 filters and UV lights will purify the air a few times per hour, they are expensive but very effective and are employed in hospitals with great results. If you can research ASHREA standards for hospital spaces and employ the same air change strategies in the space of concern.
ASHREA to my knowledge has not come up with any “hard” recommendations just CDC guided suggestions. One thing for sure is commercial HVAC considerations will forever be changed by this virus. I expect to see a lot more air changes and more outside air being brought in, MAU units and VRV systems will be the norm.