Just wanted to say I managed to get Cloudflare Tunnels to work just fine on a RUTC50 router by installing cloudflared.
This allows me to access my router remotely without needing DDNS, which will not work on many mobile carrier solutions anyway, since the block incoming requests.
It may work for you, if you have a router that runs on the ARM architecture. I have written about it here: How to Access a Teltonika Router Behind CGN with Cloudflare Tunnel | Constant Solutions - perhaps you could use it as inspiration. Feel free to comment on the post if you have questions.