Well, guys. I've successfully managed to get an unwhitelisted BIOS from F40 just according to @adrian_sa reference, and also shrinked the MEI firmware. There is two things to notice:
1. use UEFITool (non- NE Alpha -version) to drop unnecessary modules, and Andy's Tool to determine what modules is needed to be dropped. Last one reads module names better, but first one rebuilds modified image correctly.
2. Internal programming is impossible at this moment, since even after descriptor overrided there are some locked regions remains. But, forget about it - if you flash broken image, laptop will turn into aluminium brick. It even will not turn on. External programmer is needed in any case.
But well, i'm not interested in a loss of bunch of time when trying to get mSATA to work by replacing modules from similar platforms. I've built coreboot with platform config modification - just replaced 0x33 for 'sata_port_map' to 0x3f in 'devicetree.cb' file for our notebook. And - yup - it works, mSATA is binded to the SATA port2, correct value is 0x37. If someone want to make it usable just as ASPM was done - you may use setpci and this file for reference, but more work than just 'setpci -s 0:1f.2 92.w=8337' need to be done there. Full SATA reinitialization in most difficult case.