Guys, Serg is from Ukraine and there is war now. Who knows, maybe he is in Ukrainian forces fighting for Victory.
OT: Try to find all instances of "ALASKA" w/ UEFITool. In this bios it found 30 entries, not all are visible in hex-editor, some parts are compressed, and not all strings may to be modified/overwritten. Be careful: For modding DON'T use UEFITOOL NE. This can result in non-functional bios. OA2+PK+marker has to be inserted in GUID 8C8CE578-8A3D-4F1C-9935-896185C32DD3, but both volumes are to small to hold the code. I guess, the higher-level volume (GUID: 9E21FD93-9C72-4C15-8C4B-E77F1DB2D792) has to be extended. I tried a similar mod a few month ago, but did't get feedback if it worked or bricked. The string in Fid/SignOn can directly edited in hex-editor (as far i know). Some bioses contain empty dummy-tables for marker/pubkey, but i guess this one is newer and they omit OA2-activation complete.
Sorry, was just giving it a try as i was into that topic and the actual content seemed similar. In that case im out of the game