Struggling with Rock Band 2 and 3 DLC on a new Wii U

I recently was gifted a free Wii U (awesome), I got Aroma setup, vWii cIOS changes, PriiLoader, etc all done.

Installed all my emulators, homebrew, Wii U titles and tons of Wii / GC / N64 VC injects made via UWUVCI.

My one hangup is Rock Band 2 and 3 DLC, I cannot for the life of me figure out how to make it work, from what I understand you cannot export / import it from another Wii or Wii U to another, so stuff I do have legitimately is locked to an old 2008 Wii.

I have tried the following:

1. Use the community preserved large files, I couldn't get them to work in various Wii Utility apps.
2. Using individual files and converting them to BIN files, dropped into private folder on SD card in both data and title folder workflows, the bogus ticket install files all fail with error -1022, even though I built the bins and install files using my vWii's device keys and cert file.
3. Using individual install files, they also fail to install directly via YAWMM, I was hoping I could install some to NAND and then move individually to SD Card.

Aside from that whenever Rock Band 2 boots up, regardless of whether or not I have anything on my SD Card, it always says it cannot save to SD card as is it corrupted. Rock Band 3 never complains though.

With the DLC servers offline, I am just not sure how to make it work.

Some people say don't bother, just use Rock Band 3 Deluxe but information on that is scare for Wii as the current version of it for Wii is "unstable, for Development testing only".

Has anyone had luck with install RB2 and 3 DLC on a WiiU with Wii VC titles?

Is RB3 Deluxe the only way? Does it work as a VC Title? I don't want to have to use a loader in vWii.