UWP - can't interact with localhost IBM Sametime

Question

I have a UWP application that should interact with local Sametime client through REST API that is hosted on localhost by I faced with the issue - that's restricted to call localhost from UWP app.

There are a few of solutions:

1. Create a proxy(e.g. WCF) that will interact with localhost.

2. Execute "CheckNetIsolation.exe LoopbackExempt -a -p=SIDHERE" in cmd on each client machine.

But I need a solution that will allow me to use just only a single package file to deploy my application. So may be there is any more elegant solution to solve my problem?

Thanks!