There will be a minor Dorico 3.5 update coming soon that will not include this latest version of Bravura. At the time of writing, SMuFL 1.4 is not yet finalised and the current version of Bravura published on GitHub is considered a pre-release.
The changes to the existing glyphs in the HEJI range are very minor, affecting only the placement of a couple of glyphs by a very small amount, because Marc Sabat and Thomas Nicholson requested that they be changed to ensure better placement for notes both on lines and in spaces.
I would expect that after installing the new version of Bravura, it should be possible to adjust the placement of those glyphs in your accidental definitions relatively easily. But you cannot easily have multiple versions of Bravura installed.
At the moment, the issue you will have is that it is laborious to apply that change to every project, since you cannot tell Dorico that you want to import a tonality system on top of an existing one; it will always bring it in as a new one.
However, in the next major version of Dorico we anticipate having features that will make it easier to import items from another project or a saved library file with greater control over whether the imported item should replace or sit alongside the existing one in the project, and that will hopefully make this easier to resolve.
