a chance possibility is the Bill in Govt will pass (I believed it has already passed the House committee), and then you could create a SHNEC retroactive (After plan year end) at 4%. so if you have a plan doomed to big failure then there may still be hope.
The Bill eliminates the safe harbor notice requirement, so without going back and looking at it, it might be in there to amend to a 3% SHNEC before the end of the year as well. my brain is crammed too full of useless stuff so I don't remember now) There is no such option for a match because of course, that depends on whether someone defers.