Hi @pedrohsk1
I tell you that I own a WR741 v4xx router and of course you can perform the function that you need from just a simple router (DHCP, PPPoE, etc) without enabling WiFi I suggest installing LEDE 17.01.6 in its Lite version of my other post
[UPDATE] LEDE 17.01.6 custom builds for TP-LINK WR841N(D) WR941N(D) WR743N(D) WR741N(D) WR740N(D) All Versions Highly recommended
But you like OpenWrt you can use any of my custom builds but without enabling the apps that are not necessary (Adblock, DDNS, UPnP, etc)