If I remember correctly some users offer this service, but considering your rank and reputability, it will be difficult to get a loan of testnet coin. It might be different if you offer collateral though. Take a look at the dev & technical discussion board or mining board (can't remember which one).
Or you can try regtest as mentioned above. There is no other choice since testnet coins are not free.
Owing to my reputation, I think you're right. No one will offer such a huge amount of loan. But the problem would be that I wont be able to use regtest coins outside my own network, which is a factor to consider if I'm collaborating with a bunch of people. I don't know if it happens for Signet too. I currently have nothing to collatralize so I think I need to go with using VPN with faucets and carrying out multiple microtransactions to my address. Can I mine it by some way (without ASICs of course). And how do the faucet owners get their hands on such large amount of Testnet coins?Or you can try regtest as mentioned above. There is no other choice since testnet coins are not free.