I integrated 'fixed drive' USB driver. Cfadisk is active at textmode setup, first boot to gui setup and following bootings. 'fixed drive' usb driver integration.

I'm guessing its detection routines are deeper than the basic partition based stuff then. I have a 1GB USB drive that I messed with the partition table of to make it look like a fixed disk so that it could have multiple partitions and boot as a 1GB DOS boot disk. I think I used the tools that were used at the time to make the UBCD a USB bootable thing to mess with the partition tables.

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Does the Windows 8 stuff look deeper than the partition structure? It looks at the actual disk, you can partition up a removable USB stick, but it still looks at the driver loaded and if its detected as removable it'll fail.

So you need to modify windows. Using the USB filter drive to pretend its fixed gets around it, but installing the driver into the image isn't enough. The bootable image will be using the windows driver and fail to read partition 2, so here deleting the 350mb boot partition, marking the remaining windows partition as active get around it. Then once booted you can modify the driver used to be the filter driver and you're good to enable bitlocker and have multiple partitions again. Any USB stick with atleast 32GB should work with the above method.