Or more likely, link Helium to the Packet Forwarder that TTI run that can then peer to TTN/TTI. I have the feeling you’d know this if you appeared to be less of a Helium advocate and spent more time using TTN.
However you’ll see this suggested many times on the forum and the prime issue is who is going to provide rewards for Helium traffic.
I think the script-kiddies jumping on the Helium bandwagon to mine for crypto will turn off their gateway and put it in a drawer. Only a few will be bothered to sell. The very best solution for Helium would be to drop the mining BS, just use hard cash and pay a premium for gateways that provide coverage in the gaps - a combination of GPS and uplinks arriving between two or more gateways with unrelated owners on a cascading system would be a start.