Many fan reference works put TOS in the 2260s, including the 1980 Star Trek Maps -- the Introduction to Navigation booklet that accompanied the maps said that Cochrane invented warp drive in 2050, that the Romulan War and the "Archon class" were in the 2160s, and that the "time barrier" was broken in 2243. And all its references to TOS episodes place them in 2261-63. The fan-made Federation Reference Series, by TrekBBS member aridas sofia, also used this scheme, putting the Organian conflict in 2261 and the change to TMP uniforms in '66. The '77 Star Fleet Medical Reference Manual from Eileen Palestine, Geoffrey Mandel, and Doug Drexler puts the destruction of Ingraham B and the discovery of the Horta somewhere around 2260 in its rough medical timeline chart. Drexler and Mandel's 1980 Enterprise Officer's Manual puts Kirk's birth in 2229 (which would put "The Deadly Years" in 2263, a slight discrepancy), "Where No Man" just after 2260, and Kirk's promotion to admiral in 2265. (It puts the loss of the Valiant in 2071, by the way.) The '87 Ships of the Star Fleet Volume 1 puts ST:TMP in 2267... and ST III in 2287, which I guess is their attempt to reconcile with Morrow's "20 years old" line, but makes no sense otherwise.
Indeed, other than the Spaceflight Chronology, the only pre-TNG tech manual/reference-type works I can find that use the earlier dating scheme are the ones by Lora Johnson (known as Shane Johnson at the time -- she's recently transitioned). Both Johnson's 1985 Uniform Recognition Manual and the '87 Mr. Scott's Guide to the Enterprise put the end of the 5-year mission in 2212 and TMP in 2217, oddly enough -- and even more oddly, the latter puts TVH in 2222, which doesn't add up at all.
So if anything, the general consensus of fan tech authors (including Drexler and Mandel) was apparently that TOS happened in 2261-63, give or take. The earlier dating scheme seemed to be used mainly by the SFC, Johnson (roughly), and the occasional novel like Final Frontier (which put Jim Kirk's 10th birthday in 2183, corresponding to a 2207 date for "The Deadly Years").