Special 'fillet' as reinforcement for propeller blade (how? +example)

Hi guys!

I'm working on a propeller model, and want to create some sort of reinforcement for the blade root connection with the hub.

Here is my model and an example for a propeller with the reinforcement:

A simple fillet is impossible because of the thin geometry of the blade root curve.

Any ideas/guidance/tips on how to do that?

Thanks!

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