I don't think toe covers go back far enough to be trimmed and still stay on.
I still have two sets of Adidas toe covers I always used to use but they don't fit any more.
Loved those things. Never used shoe covers with those.
It’s the full booties I have. They’re almost too insulated. I still get cold feet but slackening the shoes off helps. I’m even packing ‘foot warmer’ pads that people use for skiing, just in case it’s brutal. Never tested them but if it gets bad enough to try them then it won’t matter anyway.
I have the Assos early winter ones. They’re quite tough so could probably handle a bit of extra trimming and stitching.