What would you need 50 testnet coins for, that 0.50 or 0.05,
xender discord omegle or 0.005 will not suffice? I don't have that much either, but you can always get from the many faucets a small amount. It's for testing, the amount should not matter.
But I'd like to also know if there are any other ways of acquiring such amount of testnet coins other than mining them.
It will obviously not be destroying those coins so if you would like I could return it to you or to a faucet of your choice.