I have kept half an eye open for updated workarounds since the Feb 25 change and haven't heard of any.
In my personal framework, once I've bought a copy and supported the artist, it doesn't weigh on me to acquire a copy elsewhere. YMMV.
I'm choosing to buy from Not-Amazon going forward. All the major alternatives I've looked into similarly lock the content to their readers and apps (based on agreement they have with author), but unlike Amazon, they state it clearly up front and aren't changing access retroactively.
Shoutout to bookshop.org for being crystal clear in product descriptions when an ebook is DRM-free.