if you have 7 disc you can make winpe with aomei winpe builder
you are completely mistaken when you say that gpt is only for internal drives 2,2tb and larger - it is of course for every drive 2,2+, because only gpt can see entire drive - old type partition table mbr can see only 2,2 tb, so what point in offering external drives 4tb of which a half is of no use at all
so to use your entire 4tb drive you have to make it gpt, ie convert it to gpt with diskpart from winpe, create partitions, etc
winpe should work because diskpart and disk drivers from vista up work with gpt - even 7 32 winpe should work, because 64 is necessary only for booting from gpt, not working with it
also, in case of large drives should be remembered, that older systems, up to 8, work only with so called 512e drives, ie emulating old 512 byte sectors, not with 4kb native drives, with 4kb sectors without emulation