Cool project. But why tunnel Telegram specifically? This could be a yet another VPN protocol.

There are some useful ideas from SoftEtherVPN, BitTorrent, Yggdrasil Network, and Tor you could borrow, if you're looking to improve this. The ideal tunneling solution, which doesn't exist yet, is one that not only evades DPI, but also onion bounces you through nodes in a decentralized ad hoc network, and does automatic node discovery.