Is it possible to create a restlet to call a standard NetSuite soap service?

I believe it’s possible, in fact there is an article stating how to do so: https://blog.prolecto.com/2014/09/28/pattern-to-make-suitescript-call-to-netsuite-suitetalk-web-services/ But keep in mind that is eight years old and using SuiteScript 1.0 and a much older WSDL, so things may have changed since then. The real question is, why do you need to or want to? A restlet can do all that the soap web services can and more, and is far more flexible than SuiteTalk. If it’s just a matter of wanting the functionality of SOAP web services, but preferring to use a JSON-based REST-style call, there are already the REST web services which provide a the same functionality of SOAP and more, and it requires no scripting inside of NetSuite.