I've seen this suggestion before, but forgot if it got declined, or accepted. It should be prioritized in my opinion because people want to play RSPS for the fun PvP/Gambling aspects that they couldn't have had on OSRS. Some love the competition in the Hi-Scores as well, and others the achievement of doing everything on their own (Ironman game modes). This is literally the perfect way to balance all of these aspects, while maintaining everything else the game provides. Omicron has put a ton of effort into updates, and was the first RSPS with raids, and that itself is a huge feat. I wouldn't doubt that he could pull this off, and people underestimate how much this could increase Alora's player base. Very underlooked suggestion, should be prioritized considering the amount of content Alora already offers.
This.
I don't know how well Omni can develope, but he has to be well above average to get this far.
If it is only himself coding it may take a while, but it wouldn't be hard to actually do; just very time consuming.
There's a lot of different ways to go about it as well. You don't have to have a 2nd world (which I'm assuming is what he thinks he would have trouble with/supporting), perhaps you could make a new account on the main world and do it that way?
But yea, like you said this would really bring people to the server.
If he isn't working on anything else after construction he should perhaps really look into doing this.