Internal alternative to the mustache shield (2.0.1)

I need a smaller, “internal-izable” alternative to the mustache shield for powering my Spark.
I want my device to be chargeable and powerable through a micro-USB port, but stick to a 3.7v lipoly battery when not directly powered. Just like the mustache shield does, but I need this soldered in directly, to the VIN (or 3V3) pin, and in as tiny size as possible.

I was looking at the following SparkFun product:
Would it fit the bill? I’m not entirely certain from the guide if it can do both the powering and charging simultaneously.

Other possibilities would also be welcome.

@noora, @timb is working on an amazing battery shield as we speak!

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