That wouldn't ruin the fun at all! The ending for Bucky that always appealed to me most personally is something like what you describe, where he's able to find what he needs within himself and is the one doing most of the heavy lifting, but there's also outside help to mitigate the very worst (of course in my head that also means Steve always being there for him in some capacity because I am an inveterate sap who loves those two so much and can't see Bucky ever erasing their relationship no matter what that would mean for him ;P). But wherever you chose to go if you do add that coda is fine by me.