Using Powershell to find the right PIDs to kill - powershell

Question

I've hacked together a solution that allows me to commit changes to my Go language application to Azure Websites, compile into a Go binary, and then update the Web.Config to have the httpPlatformHandler use the newly created binary. This allows me to easily deploy changes to my Go app and have them (almost) instantly available on my Azure website. It's a neat prototype, and you can check it out here: https://github.com/wadewegner/azure-website-go-builder/
If you look at the last line of the deploy.cmd you'll see that I use Powershell to kill a w3wp.exe process. This forces it to restart and use the updated Web.Config.
powershell "stop-process (Get-Process w3wp | Sort-Object ws | Select -first 1).Id"
This is a hack and not ideal. In a default scenario there are two w3wp.exe processes running - one for our website and one for the SCM website (which is a management website). It will not work if we have more than one instance of our Azure website running. It also assumes that the right process to kill is the one with the smaller memory footprint - this is a bad assumption to make.
In Azure Websites we don't have a lot of facilities at our disposal for finding and killing processes.
When I run Get-Process w3wp ... I get this kind of output today:
Handles NPM(K) PM(K) WS(K) VM(M) CPU(s) Id ProcessName
------- ------ ----- ----- ----- ------ -- -----------
364 40 7196 16032 85 0.55 5516 w3wp
667 77 61972 77372 350 5.72 3448 w3wp
However, with two instances of my website, it could be:
Handles NPM(K) PM(K) WS(K) VM(M) CPU(s) Id ProcessName
------- ------ ----- ----- ----- ------ -- -----------
364 40 7196 16032 85 0.55 5516 w3wp
364 40 7196 16032 85 0.55 5517 w3wp
667 77 61972 77372 350 5.72 3448 w3wp
(Manually updated to make my point.)
So, the question is, what's the right way to choose the two processes I want to kill? I don't want to kill 3448.
Additionally, how do I find a better heuristic to choose the right processes?
I uploaded tlist.exe to run tlist -t and get this output:
D:\home\site\wwwroot>tlist -t
AdjustTokenPrivileges failed with 1300
w3wp.exe (5516)
20150107_070323.exe (4936)
w3wp.exe (3448)
cmd.exe (1976)
tlist.exe (5868)
This makes it clear that 5516 is the PID I want to kill.
Is there a way in Powershell to run Get-Process but if it somehow inspect child processes and filter out the w3wp.exe PID with the cmd.exe process?
Thank you!