I honestly think you are going to run into all sorts of timing issues if you have both the soundbar and the AVR decoding Dolby Digital (never hurts to try, but I have the feeling they would be out of sync with each other). It's also a very small soundbar (from your pic), so you're not going to get much sense of left/right/center/surround.
I think a better approach would simply be to use your soundbar as a center channel, and use the Advents as Left and Right (for a 3.1 setup). It looks like the soundbar has an RCA input, so you could drive that with the center preamp out of your AVR (setting the soundbar to stereo). Then the soundbar would drive its wireless sub as a "large" center, the AVR would power left/right, and you could drive your wired Boston Acoustics wired active sub from the AVR sub output. Set the center to "large" in the AVR speaker setup to take advantage of the soundbar sub, and set the surround channels to "off" so that surround effects are routed to the left/right/center speakers. I think that setup will be better (true left/right/center) and much more likely to be in sync since shouldn't be much latency for stereo through the soundbar (even then you could compensate a bit with center "distance" settings in the AVR).
I suspect your AVR does not have have preamp outs, then you'd need a high-level to line level converter (to convert Center speaker out to line-level RCA) and you'd need a splitter cable to feed that center to both left and right soundbar RCA inputs (high-level/line-level converters and splitter cables are very cheap on Amazon).
One problem you may run into with the AVR is that some content from Roku (for example) is now encapsulated in Dolby Digital Plus (7.1) even though the content is only 5.1 -- for that DD+ content your older AVR may revert to stereo rather than DD.
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