If I understand the plan, allowing users to have a one time fee to interact with the dapp in stead of a per transaction fee, we would be super interested to help, we have experience building an alike solution in Polkadot, something that I think is super valuable to further explore.
As for whether Polkadot is the right place to build, Polkadot is the strongest tech in the space, working hard on realising the true web3 vision.
Developer Experience wise, we have a lot to learn and improve. However, we can give you the guidance and support you need and we would be interested to hear where we can improve our tooling and educational resources.
I work at R0GUE, a company that builds Polkadot Developer tooling and is part of the ink! alliance (Polkadot’s native Rust smart contract programming language). We have a lot of experience in building chains and smart contracts in Polkadot.
Feel free to reach out if you have any questions or need help: Telegram: View @go_r0gue