Bluetooth adapter for Atari 9-pin joystick

Hi - I have an old Atari style joystick and as a learning project I want to make it bluetooth-able. I've researched this before and have a tutorial to follow and circuit diagram etc but it uses a Bluefruit Ez-Key HID, which as far as I can see is no longer available.

I wanted to ask is there an equivalent product I could use for this project? Is there a successor to the Ez-Key?

many thanks.

Is it a bad question? Or just nobody's sure on the answer? thanks!