Sorry for wasting your time
Ok, so it turns out it was all due to my naivety. Just to be certain I reset and re-jailbroke the device several times, connecting to my account at different times. Each time the device connected to the Amazon servers, the device installed the Japanese banner ad and screensaver.
TL;DR below - make sure what you're buying is a local product!
I purchased the device for an excellent price from what I believed was an Australian website. After speaking with Amazon customer service, it appears the device was originally purchased in Japan. Although the listing made no mention of it being a foreign item, nor being a SO model.
Anyway, after some discussion, Amazon Australia was apparently unable to remove the banner ads as it was a .co.jp model. The customer service lady essentially told me I needed to suck it up and swipe the screen because there was no way she could help apart from send feedback to her superiors and there was no ETA on removal. I continued to ask politely if there was anything that could be done and if I would be kept in the loop as I don't want to have to keep swiping - I'd rather send it back, get a refund and buy another without the SO nagging. She sent an email to her .co.jp colleagues and I should receive an email update within 1-2 days.
So I did a little Goggle searching and happened upon a reddit thread of someone who had the same banner ad problem. He contacted amazon.co.jp but they apparently couldn't remove the ads. He kept pestering Amazon via chat and eventually customer service at amazon.co.uk (where he lived) was able to remove the ads. So it CAN be done, but it may take some persistence!
I just wanted to thank you for trying to help me. I've been a long time reader but never needed to register or post until now.
Interestingly, I find my Kindle Touch 6" (low res) screen sharper and higher contrast than my 300dpi Kindle PW4 which is a little disappointing, but the light's going to make reading it in more places much more feasible.
Now to get on to working out how to manage collections in Calibre - the sole reason I've jailbroken this device! I'm sure I'll find some other ripper applications to load.
Thanks again!
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