If a smart power plug is currently overpriced, using a Mini Smart Switch can be an alternative method, especially if it’s going to be a permanent change. However without any case or box it’s a safety risk. Adding a DIY simple plug power box and a socket might make sense, if you’ve got them spare. Essentially making it an extension lead.
Links & References
Simple Plug in Light and Switch – YouTube
Electrical Wiring Colours – A Complete Guide | RS