Your proposal for off-chain participation in DLCs seems innovative, leveraging multisig contracts for shared custody and pre-signed outcome transactions for off-chain ticket sales. This method reduces fees, enhances privacy, and introduces microtransactions, fostering new business avenues. Concerns might arise in encrypting partial signatures to prevent collusion and ensuring oracle-dependent outcomes. Its potential spans lotteries, microtransactions in gaming, and scalable participation scenarios. Vigilance is crucial to detect bugs or vulnerabilities, but if implemented securely, this approach could revolutionize DLCs by broadening accessibility, minimizing costs, and expanding use cases in various industries.