The new beta of PGP Whole Disk Encryption supports now Windows PE (see release notes). There is a 30 day trial download free of charge. http://beta.pgp.com/
Would be damn awesome if someone could create a plugin or some instructions to include this into ubcd4win.
And before someone is asking:
- it`s offical from pgp crop
- no this feature is not less secure
- you still need to know you password, no password = no access, same like booting from harddisk