The easiest way to fix this, IMO, is mail in the Form 8453 to the IRS and attach the 1099-B portion of the DRIP sales. TurboTax should have completed the Form 8453 with the last box checked, "Form 8949, Sales and Other Dispositions of Capital Assets (or a statement with the same information), if you elect not to report your transactions electronically on Form 8949". Just mail the two documents to the address shown on page two of the form, Internal Revenue Service, Attn: Shipping and Receiving 0254, Receipt and Control Branch, Austin, TX [removed]. This way, you don't have to enter, as you wrote, "every tiny purchase transaction".
See the instruction on page two of the form: https://www.irs.gov/pub/irs-pdf/f8453.pdf
No idea why TurboTax removes the zip code, it is 73344 - 0254
