"I'd love it if there were a thumbnail creation tool that I could point to the folder and have it overwrite the current thumbs with newly created ones as a batch."

If they have the same file names: paste, or drag and drop, and replace?

Edit... cross post with HartyBart

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W10 Pro, HP Envy X360 Laptop, Intel Core i7-10510U, NVIDIA GeForce MX250, Intel UHD, 16 GB DDR4-2400 SDRAM, 1 TB PCIe NVMe M.2 SSD

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