The smallest useful thing you can broadcast is the latest block hash. The second most useful thing is the latest block template (see sparse pool by nostr:nprofile1qqs2n7lm5p2ghxtchy9er5nqk32lyucflru544xcdsrnwarus2wvhtgppemhxue69uhkummn9ekx7mp0qyg8wumn8ghj7mn0wd68ytnddakj7qgawaehxw309ahx7um5wghxy6t5vdhkjmn9wgh8xmmrd9skctcw5924l). These things can be obtained for free from block stream because it's a one way broadcast of data that everyone cares about.

Traffic from miners is different from traffic from Netflix, because the miners have very little traffic, but the traffic that they do have is very valuable on a per Byte basis.

Your two way link is especially interesting for miners who want to get their nonces to a pool ASAP. These miners already have a block template from spares pool or from block stream, but they need transportat to get their nonces out reliably. Depending on the energy source, they may not have an economically viable uplink, unless if they pay per Byte to use your satellite dish..