Why not develop or sell software that uses two keys.
An entry key and an erase key.
When the authorities ‘request’ you provide the access key, you give them the system erase/delete key which wipes the drive completely clean.
I assume they would clone the HD they are wanting to decrypt and do any work on the cloned drive.
If they did manage to wipe the cloned drive, they would just start over from the master drive in your computer or one of the copies they made earlier.