Well, I downloaded a hex editor and successfully edited the save file. Got it on the first try, actually, so it only took like 30 minutes to figure out. For posterity's sake, here's what I did:
in a hex editor, ctrl-f "Xeno Influence Module." Here's a portion of the data from just before the text:
00 00 00 00 8F 01 00 00 15 00 00 00 58 65 6E 6F 20 49 6E 66 6C 75 65 6E 63 65 20 4D 6F 64 75 6C 65 10 00 00 00 54 68 61 6C 61 6E 20 49 6E 66 6C 75 65 6E 63 65 41 00 00 00 41 70 70 65 61 6C 73 20 74 6F 20 61 20 62 72 6F 61 64 20 72 61 6E 67 65 20 6F 66 20 73 70 65 63 69 65 73 20 74 6F 20 77 69 6E 20 74 68 65 6D 20 6F 76 65 72 20 74 6F 20 6F 75 72 20 73 69 64 65 2E 0A 00 00 00 53 74 61 72 62 61 73 65 30 31 00 00 00 00 07 00 00 00 43 75 6C 74 75 72 65 03 00 00 00 02 00 00 00 6A 00 00 00 00 00 00 00 28 00 00 00 D7 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 25 00 00 00 98 00 00 00 00 00 00 00 00
Change the red number to 00 to remove the prereq. I think setting it to 6B should change the prereq to the utopian societies module (the 50% influence module from hyperion starbases), but I didn't actually test it.