Yeah, the wiki is really for mains that can just buy whatever gear they need. As a ironman, you really just have to use the best gear you've got and go with that. In the beginning of everything you're gonna get really short trips, but that is the ironman life. Just know that whatever "minimum gear" they got recommended, you can properly do it with worse gear.

For specifics like dag prime, you should just safe spot it with a ibans staff. It's easy enough, the worst part is getting to the safe spot. You can pm me if you want any help

Wouldn't worry too much about that, in general stats and weapons are way more important than gear. You could probably manage DKS with ancients, a magic shortbow and a dragon scim. Blood spells are super handy too!

Just out of curiosity, do you mean Dagannoth Rex? The Zerker ring is a really solid upgrade, the other two are tiny DPS upgrades -- being in the endgame the only place I use Seers ring is for Theatre of Blood if I'm freezing (pure btw), I haven't used the Archer ring in yonks, lightbearer or suffering are usually way better for ranging.