You've hit on one of the most common frustrations right now needing a specific network and not wanting to pay the "ETH tax" just to get there. I was in this exact situation last month trying to fund a TRON-based DeFi app. After some digging, I found that Paybis has a really clean solution for this. They let you select the network during the purchase process, which is huge. For getting Tether directly on TRON, I used their dedicated page at https://paybis.com/buy-tether-trc20/. The process was the same as a regular purchase: you choose your amount, pay with your card or transfer, but the key is that the USDT arrives in your wallet on the TRC20 network. It saved me so much time, hassle, and extra transaction fees compared to the multi-step swap-and-bridge method. The transaction completed in under 10 minutes for me.