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That’s correct, it is not worth using. There are currently no other PS2 to Xbox 360 adapters/converters.
(I’m assuming you still also want to have a stick that works with your PS2.)
Have someone modify your PS2 MAS stick to also work with Xbox 360.
Buy a new Xbox 360 MAS stick so you have both.
Buy a new MAS stick that works with both PS2 and Xbox 360. Sell your current PS2 one on here or eBay.
Order a custom stick instead of a MAS, as per any of the above.
Switch over to Japanese sticks. Buy a Hori Fighting Stick EX2, or a Hori DOA4 stick, or a Hori VF5 Live Arena stick (they’re all the same thing). Optional but worth it IMO: have somebody swap all the stock parts to Sanwa ones (official arcade brand).
For the record, you’re best off posting these sort of questions here to start.