Is it possible with low skill levels to maintain a bond or at least a large portion of it?

My friend and I are on winter break and we recently got into Runescape. We are both willing to buy a bond and we have a lot of time to spend on the game. We just don't want to have to buy a bond more than once to keep the membership. Are our expectations unrealistic with my current stats? In F2P, I have smelted mithril and rune and sold the bars for like 4m an hour, which is pretty light considering I can watch Netflix while doing it. Maybe as a member there's an even more efficient method or something?

https://preview.redd.it/awtitzjagf9e1.png?width=225&format=png&auto=webp&s=56a57662e2fc0af71315b853b7366713b75d5453