I just saw this aluminum gearbox as a June 2022 release from Corally. It's 65 Euros.
https://www.corally.com/New-Product...earbox-Case-Set-Swiss-Made-7075-T6-Black-Set/
https://www.corally.com/New-Product...earbox-Case-Set-Swiss-Made-7075-T6-Black-Set/