It is not possible to virtualize AppX Applications/Bundles using App-V.
It is possible (I didn't say recommended) that you can use the App-V infrastructure to deliver AppX packages. To do so you make a dummy App-V package and in the sequence editor right click on the "Scripts" folder to add the bundle file. You
then add an AddPackage script to the Manifest (internal AppXManifest.xml or external DeploymentConfiguration.xml). The script would use cmd.exe and reference the command line method of adding the bundle. The bundle filename would be referenced
as ..\Scripts\bundlefilename in that command line.
Note that whoever disabled the Store (probably via GPO) might also block this method. To test, just copy the bundle file to a test client and try doubleclicking on the file. If that installs it, so will the above.
Tim Mangan MVP for App-V and Citrix CTP Author of AppV books: "PowerShell with App-V 5 (5.1 Edition)", "The Client Book (4.x)" and "OSD Reference Book" (http://www.tmurgent.com/Books )