new rudder conversion

Hello all. New to this.
Is there any sort of new style rudder that can be adapted to use the old style gudgeon?
It seems that the pintle pin can be easily removed and then a different (retractable) rudder positioned within the gudgeon (see attached photo), but I don't see this discussed or advertised anywhere online. All I see discussed are replacements that require creation of an access port and such.
I really need to have a retractable rudder... the fixed old style rudder is killing...

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