There's a low-fee vault for auto-compounding ALCX rewards available now at https://nuggies.fi/. The fees are currently set at 2% for performance and 1% for gas compared to 20+% from pickle / mushroom. The contract is immutable (fees are adjustable but current fees are the maximum).
There were some security concerns when I initially posted this in the discord. Since then I've posted the vault on ImmuneFi with a bounty and also reached out to Ashiq Amien from Iosiro who confirmed that it looked good. He has previously discovered a vulnerability in the Alchemix codebase.
The contract code is <200 lines and is available here:
https://github.com/nuggiesfinance/platform/blob/master/contracts/Vault.sol
The contract is also verified on etherscan at:
https://etherscan.io/address/0x000000004a434312bfcbb119fa7bbdf7169fdc56#code
I'd love to hear any thoughts and suggestions!