Yes.
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Make a copy of the kids app.
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load this version of the aia to the test server https://ai2-test.appinventor.mit.edu/
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make sure you use Companion 2.70t1u as shown on the test server splash screen.
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build the apk using the test server
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load the apk to the phone using the resulting QR code
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the app should run on the phone
I tried this using the test server and it works.
Try it. Good luck.