tems z750 firmware is not real firmware,but update : it is signed file archive and signed firmware.
signed file archive can be converted into .zip (setool2 package) by one small tool.
i do not see any problem to publish converted zip, so everybody can "flash z750 tems into their retail z750"
alas, it will not bring tems or even tems firmware inside phone - cause even you extract .cxc files from signed firmware archive, form it as package and write in phone - you will get dead phone - .cxc are signed too and security is very same as firnware security.
so, you need to convert phone into brown (r&d) for working (but not activated) tems firmware.
that can be achieved with so-called "reset loader".
another problem,that reset loader is not so widespread (though everybody who need it have it).
okay,lets assume you have that loader and know its commands.
you will notice now, that "certificate reset" is not possible on retail phone without executing P96 (triple as old P22) authentication.
usual service dongle will not help you,cause it not have rights to use KIDP96315031 key.
so, that is place where user will stuck.
okay, lets assume user has good relations on chinese factory and got access to reset station or simple bought brown phones (it is not hard when you know right man).
now user need to activate TEMS license, which is much better secured.
good luck in your search.
http://rapidshare.com/files/138147093/Z750_TEMS_R1B_FS.zip.html