It can be converted to a smart switch, the main problem is room for the larger switch, I have needed to use spacers with some of mine to get the extra room.
There are three types of smart switch, those which need a neutral, seems you don't have a neutral so can't use that type, those which allow a small current through the bulb to work the switch, and those with batteries to work the switch. I prefer the latter, as no problems with bulb staying on dim when switched off, and no problem with shimmer when switched on, and with a power cut on return switch stays as it was before power cut.
To reduce the power they need to use most need a hub of some sort, some hubs need hard wiring to the router, some just need plugging in some where, the type of switch with a neutral may not need a hub and there is always 230 volt at the switch, but those without a neutral nearly all need a hub.
I would say if using a single bulb then swapping to smart bulb is likely better option. Only if multi bulbs or a type where smart types not available are you better with a smart switch. There is also the smart relay which goes at the lamp.
Most smart switches with no neutral or batteries with have a list of bulbs that will work.
here is an example I found the G9 bulb did not work, and needed a load capacitor adding and still had a flicker, hence why I like the switches with batteries. The ones I have you do not need to remove switch to change batteries, the front comes off to do that.
However since you need a hub, you will want to select a make and stick to it. I have ended up with 4 hubs. So question is what else do you want to make smart? So I now use TP-Link (Tapo) smart switches, but also have some Energenie (Mihome) type, and also loads of smart bulbs, and light strips. Advantage with the bulb is it can also dim and change both colour temperature and colour and some times they do not need a hub. In the main turning lights off/on will switch on a smart bulb, but you need app to turn it off, or voice control with likes of Google Nest Mini etc.
With two way switching, either use a relay instead, or you are more limited, and you need a pair of switches, the Energenie (Mihome) do a two way system, with a master and slave switch, but most you need to remove two way switching, but with the TP-Link (Tapo) for example they also make smart buttons which can replace the second switch that needs no wiring, and has a magnetic back and comes with a plate to mount it on.
Wait for other replies, as you may get pros and cons of other makes, I went with Energenie (Mihome) first, and 5 years latter 3 lights switches and two sockets have failed and been removed, but I did fit a lot
and no other make has been fitted that long. But that is why if you can use smart bulbs, that is likely a better route.
