There's also the join.me program. The person broadcasting needs to download and install the basic version, while the person receiving only needs to click on the link. It uses the least amount of resources and doesn't cause lag for the broadcaster. I'm not sure about 24kb/s – it's unlikely, but it's worth a try. During the broadcast, as I wrote on the portal, it's enough to show the network settings and not close that window until the end of the game (without full-screen mode).

In any case, you need to be consistent.
If there's even the slightest chance to prevent map hacking, you need to do it.