Just export to UHD in mp4 and upload manually.
If or when a feature will be added only Adobe knows.
I understand the workaround, but I purchased Elements because of its convenience. Besides 4k editing, that was the second most important feature, so not having it was a bummer. I was hoping someone was aware of a press release with Adobe acknowledging the issue and pledging to fix it.
Adobe doesn't generally release information about new features until they are available. They also don't generally add functionality, only bug fixes, as an update.
I would use the manual approach as you cannot adjust Elements youtube export settings
bitrate is too for video as well as for audio.
might be the wrong framerate as you need to keep it the same as the source.