I found this program PC/Mac: Affinity Publisher. Price equivalent to $67.
It will also take IngramSpark's cover template in PDF not the InDesign's INDD (only IMDL). It will export to PDF/X-1a:2003
Tech specs (here is ALOT): https://affinity.serif.com/en-gb/publisher/full-feature-list/
I have tested the trail a bit. Scroll all the way down: https://affinity.serif.com/en-gb/publisher/
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