Add Legacy GRUB Bootloader On External Drive

I have a Lenovo S10-3t convertible touch tablet/netbook that I am creating a multiboot scenario for.

To cover all the details, here are my disks and my partition setup.
640GB HDD as the primary drive
32GB SDCard as the secondary drive.

Primary HDD has these partitions:
MBR PARTITION SCHEME
Partition 1: Windows 8 Pro 64-bit (492.33GB) NTFS, with Win 8 bootloader
Partition 2: Mac OS X Snow Leopard (79.28GB) HFS+ Journaled, with standalone mini-chameleon bootloader
Partition 3: Linux Mint 15 64-bit (23.28GB) EXT4 Journaled, with GRUB2 on this same partition
Partition 4 (in extended partition): Linux Swap (1.27GB) ...swap space

The SDCard has these partitions:
MBR PARTITION SCHEME
Partition 1: Dedicated to ReadyBoost (5GB) FAT32
Partition 2: Android x86 4.2.2 (24.84GB) EXT3, legacy GRUB SHOULD be in the MBR of this disk

I am using the Windows 8 graphical bootloader to manage everything, as it is a touch-screen tablet, and I like having the touch support for the bootloader. So I would PREFER to use it if possible.

I have currently added entries for OSX Snow Leopard and Linux Mint Olivia to the Windows 8 boot manager, and all three OSes chainload properly to their respective bootloaders and are happy with each other.

Is it possible to chainload the Legacy GRUB bootloader in the EXT3 partition on the SD Card that has Android on it with the Windows 8 Bootloader? And, if so, will you walk me through this process?

There's a couple of reasons...as this is a touch screen tablet I would prefer the convenience of having an option to boot Android from the touch-enabled Windows 8 Boot Manager instead of having to fold the screen away from the keyboard, press FN+F11 and selecting the SD Card as the primary boot device every time I want to go into Android. I could have android on a fifth partition on my HDD, but one of the reasons for having Android on flash memory is BECAUSE I have a mechanical HDD, and I use Android if I'm actively moving the laptop around in a rough environment (say, walking or in a moving vehicle for example, and the HDD would be off since it isn't needed). I know I could use an SSD, but I prefer having a mechanical HDD in my laptop for my own reasons.

I am using a combination of VisualBCDEditor and EasyBCD, and I cannot get either to see or acknowledge the existence of the EXT3 partition on the SDCard (though they all see the EXT4 and HFS+ volumes on the primary HDD, and the FAT32 partition on the SDCard...)