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The isolation transformer permits to ground the AV inputs safely to the TV signal ground, but like vol.2 mentioned, this have a cost. Perhaps all the parts for complete the optoisolator section can be cheaper, then.
If the LA7673 have the delay line issues with direct AV, you can insert a 10k pot in the AV select pin (43) for matching the luma with chroma (using the Vcc suply of the IC, and other side of the pot to ground; the center wiper goes to the select pin). If it follow i'ts cousin logic, one correct voltage level will enable the correct needed function. Just in case of image mismatching when trying that.
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So many projects, so little time...
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