I think that you have added a very important layer to 3speak that would allow to bring external money to hive and also allow long term return for creators. I think the bottleneck might be to get enough paying advertiser for this. A solution would be to work as an intermediary for platforms like https://bitlabs.ai/ or https://hilltopads.com/. I haven't really researched the sector but I saw these platforms on other sites. There are probably quite a lot of options available. Like that you would have a constant stream of income to monetize the platform in addition to the local advertisers. I think nobody would mind to watch an ad if they earned while doing it...