I've already created something like that and it exists(https://giftgiver.site). It does get some decent usage(there's nearly 60 active delegations at this moment, you can view them @giftgiver's wallet), but having a much better version of it made by someone with a lot of experience would be awesome. I tried getting DAO funding for it back in Steem days but it never got too much attention and I haven't tried again since then to get any major funding from the DHF. Most of the power in there is curation rewards from earned from voting thanks to some delegators or powered up by me to the account or some other donators.
Fighting abuse with this is hard. Without having someone constantly monitor every account using it to make sure it's not just a vote ring, it can easily get abused. I've got some set limits with it and while I can't spend time looking at every single account using the delegations, I have friends who have let me know in the past if any users were abusers(plagiarizers mostly).