Some more info on this....I've found that the issue is with the version of EETech. If I'm using EETech v6.2, I'm able to see more than one boot disk. EETech v7 and EETech v7.1.3 will not allow me to pick anything but the local disk. Any idea as to why?
As far as I know DETech v7 and higher only supports operating from a Windows PE environment. This means you'll have to boot to a Windows PE USB to see the encrypted drive.
As to how this drive can be connected - I have seen mixed results. On some occasions I have been able to decrypt a drive connected with a SATA-USB adapter and on some I had to connect it to the the laptop drive bay.