Would you suggest using a protein skimmer even if I did weekly wc's?
Depends, I really enjoy equipment. I get more joy from researching components, theory and designing the sump systems, plumbing, automation etc. Then I do from watching the tank.
Always tinkering.
If you're that type of hobbyist, get a skimmer. Reef octopus makes a good nano HOB skimmer.
If you want a tank thats simpler just up your water changes. In reality reef equipment like skimmers just prolong and reduce the amount and frequency of water changes.
Doing a 5 gallon (50%) water change would only cost you a few bucks and would reduce nutrients in the tank and restore trace elements. A skimmer would save you some money on salt on the long run and help with continual nutrient removal taking ammonia and other organics out of the system entirely before they can break down.
Id get a skimmer but thats just me. Id also probably do a mini bean animal over flow into a 5 gallon sump too. Just for fun. Could be a cool display piece if done right.