Expert 140 Pro Sub Out without Preamp Ouput

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That sounds to me like an eminently workable scheme. If your external DAC adds a significant delay to the signal going to the sub, it will be added to any signal processing delay inside the sub, and delays due to acoustic path length differences between the sub and the main speakers. In any case, you can configure the 140 to delay the main speaker outputs for up to 20 ms to accommodate these timing differences and help with sub-woofer integration.

Out of curiosity it occurs to me to wonder: in this day and age, are there not sub-woofers with digital inputs?