@jhowell - The following was a freebie for me, but isn't one now. It refused to convert from KFX to EPUB or MOBI. No doubt another font issue. The Sample ebook might be all you need for checking etc, but please let me know if you need more.
https://www.amazon.com/Masterpieces-...dp/B07QJBP99S/
Once again thank you for your continued effort, much appreciated.