My 2c is that what's already suggested are the best advise, but why not go for SD90 and use your Audya as backup?
Also if sell Audya the price will end pretty close as if just add SD40, or .. confused

But if so, you don't have a backup. wink

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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)