Besides Open Signed Online, which is pretty hopeless when you want to debug a device, the only options at the moment are to search for someone with a publisher ID to create a developer certificate for your device through Open Signed Offline or wait for Symbian to come up with another way to get the certificate the developer. They are already planning on making publisher IDs cheaper and more accessible to people (you currently need to be a registered company), as well as wider availability for developer certificates.
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