it doesn't matter anymore, 5.5.3 and 5.5.4 now have a reliable and 100% success browserhax entry point too.
It's just easier to disable all DNS and filters
then update officially (no more need of NNU and/or spoofing, and games will even work online and have autoupdate!)
now access eshop easily to get your game
install haxchi by using latest and stable browserhax.
https://gbatemp.net/threads/more-stable-webhack-for-5-5-2-5-5-3-5-5-4-released.528757/
or the guide I rewrote (follow step1+2):
https://gbatemp.net/threads/guide-community-noob-guide-to-wii-u-hacking.451297/
If you really want to prevent future updates, you could delete the "update" folder using ftpiiu. there's a guide for that too.
Yep, there's even a trick to autoboot an URL at browser launch, so it acts exactly like haxchi's HBL launcher, except it's not offline. you need the network to access the script (but you can host it yourself on local servers).
it won't have the multi button setup, but it can launch HBL in one click. from there you just run CFW patchers manually (sigpatch2sysmenu is the best for that), and run miimaker to return to HBL until you shutdown the console (or go to settings or launch vwii)