Azure Service Bus Queue - Send Message

Hi All, 

Can anyone suggest other ways to send message from Dynamics 365 to service bus queue than using its DLL?

I cannot use Microsoft.Azure.ServiceBus coz it requires 4.6+ which is not applicable to D365 yet. And I can't use Windows.Azure as I prefer not to merged it with the workflow dlls. 

I'm trying to use httpclient instead but can't find the right way to apply SAS Token. 

Can anyone suggest other ways? 

Thank you.