Retry Soap Client request

We have a requirement to wait an abitrary time for a web-service request to be processed.

The scenario is:

1. a requestMap web-service places the request on the JMS queue
* A map may take upto 10 minutes to produce. These large requests are queued, so that two of them are processed concurrently.

2. an isMapAvailable web-service checks of the map is ready yet.
* the response contains an availableStatus element, which is one of (PROCESSING, AVAILABLE, UNAVAILABLE)
.... - PROCESSING = the map is being produced
.... - AVAILABLE = the map is finished, ready to download
.... - UNAVAILABLE = the requested map cannot be produced.
* Our client web-app loops, calling isMapAvailable until availableStatus != PROCESSING
.... - it then downloads the map or shows an error page as appropriate

3. the downloadMap web-service downloads the map and displays it = SUCCESS

But in SOATest, I can't figure out how to implement (pseudocode):

while (isMapAvailable() == PROCESSING) { sleep(1000) }

I've tried doing with with python scripts and test-variables, but it appears the design of SOATest scripting makes this difficult and complicated, and therefore not worth doing. <aside>Our business people need to be able to run/maintain our SoaTests, so we need to keep it simple.</aside>

I'm imagining a new "Retry While" sub-panel on the tab: Scenario ~ ExecutionOptions ~ TestFlowLogic ... I've uploaded a mockup as an attachment.

Thanking you. Keith.