Flex Hosting

Hello all,
 I'm trying to write a desktop application that, finally, will embed a flex 2.0

application (yes, imagine a kind of SAFlashPlayer that is
"ExternalInterface" 
aware.)

 It is a mandatory request that this desktop appl is cross platform so I am 
writing it using C++ (I cannot do it using C#)
 It is also mandatory that both applications (desktop one and flex one) can 
call each other.

 Given that situation, I am using the NPRuntime approach to build the flexhost 
layer in such a way that the flash player feels like if  it is being hosted by 
a internet browser like FireFox or safari. The results are very exciting, 
except for the interoperatibility between the host and the flash player
plug-in:
 When I use ExternalInterface to issue a call from the flex appl, my host appl 
receives a string containing javascript code. I think that flash send that 
flavor with the hope that it is going to be evaluated by its host (because it 
thinks that the host is a javascript enabled browser.)
 At this point, it is frustrating for me because I (erroneously) supposed that 
the host appl will receive an xml describing the function call (that's the 
exact way that the activex version of Flash player does when it is hosted by 
any other
 windows application different from MSIE)

 So, the question is: Is there anybody out there that know if it is possible to

"tell" Flash player to issue ExternalInterface.call in, let's say, XML
flavor 
instead of javascripts evals? 

 Thanks in advance.