Aside from the standard randomization, Krux has the user take a photo & uses that image as data for additional entropy.

For the record, I'm not involved with Krux in any way.  I watched a review of an earlier version of it by Crypto-Guide on youtube, and since hardware to run it on was under $50, I figured I'd give it a shot.  Of all the hardware wallets I've used, this is the one that impressed me the most thanks to the combination of using the camera for additional entropy, having a large touchscreen for fast & easy text entry, being fully airgapped, using encrypted SeedQR, using passphrase QR, and the UI is so clear & intuitive.  I hope SeedSigner eventually adds these features, because that's another project I really like.