The saved baseline runs all the time against all computers with relevance that looks like this:

This relevance randomizes the day it runs a scan (this is for BF Inventory BTW) to every 7 days based on computer ID. This is all working and fine.
We get occasional requests to run a scan adhoc on 1 or more computers so I wanted to create a script that did this instead of using the slow console. I could try WebUI too but wanted to script this as well. I have the code that sets this to true but I am also struggling with setting this radio button:

I played around with <ApplicabilityRelevance>true</ApplicabilityRelevance> but no joy.
So, as stated earlier, I want to do a GET on this baseline, change the title, relevance and target list in the xml copy contained in the script/memory only, then submit that xml without saving the altered baseline. I only want to alter the xml in memory in the script and submit it as an action and when script ends, that altered xml is gone by design.