I'm also rusty on WiiU hacking
it's all from memory, I didn't do anything for few years.
I might tell wrong things too.
Up to step2, it's fine. Step 3 might be wrong.
If you get a non-free game from NUS, it'll not have a ticket (no tik file), so no tik to overwrite.
There are free content on NUS with "ALL" consoleID in the provided ticket, for example demos, or some DLC like zelda or mario kart free car, etc.
I don't remember if Tik2SD actually extracts tickets (it should based on the tool's name, right?), or only generate a list.
But in both cases, you should note that some ".tik" file located on your console can store multiple tickets in one file !
You'll have to use another tool to extract them individually to match all your Titles individually (if you want to put them along the WUP installable file format)
I don't remember if step5 is required or not.
CFW will bypass signature check, but I don't remember if it also bypass ConsoleIDs.
if that's an issue, then just replace the consoleID with zeros (meaning not tied to any ConsoleID, working on all console).
The Signature won't match anymore due to edited ticket, but you can use CFW to install/launch them.