What makes you think the Westminster government would do anything more than shrug and move on?
They are not about to go altering the EA to accommodate a Scottish Government Bill, when the likes of Badenoch are already agitating for the EA to be amended to effectively render transpeople legally non-existent.
As I said, Jack made it clear at the point of announcing the s35 in the HoC that as far as they were concerned, this was the end of the matter, and it's entirely up to Holyrood to resubmit the bill in a format that is agreeable to WM even though no such format exists. It's entirely unrealistic to expect the Westminster govt to amend a UK Act pertaining to reserved matters just to facilitate a bill pertaining to devolved ones. Isn't going to happen in a million years, even if the WM government of the day wasn't already utterly hostile to the aims of the SG Bill in the first place.