Add smart control to dumb air conditioner?

Im wanting to connect my swampy a/c to home assistant. But I want to keep the use of a panel for manual control. Is there any replacement panels I can use for this?
Ideally zigbee…

I have:
fan speed (hi, med, low)
Water on/off
A/C on/off

What digital (ip connected) interfaces does the unit have if any?

If none, your options are either something like a broadlink to generate ir/rf commands (if the unit jas a remote control)

Or a smart plug…

Its too old for any fan-dangled IR or remotes… Its a basic switch operated panel. I suspect 240v going directly to the unit. But ill have to pull it off and check…