^That input card is the only way for RGB and Component with the Sony A monitors. I've seen it pop up only twice in the past year on eBay and it's $$$. So you may find yourself waiting months just to fork over hundreds. I'd sell the monitor if I were you and use that to buy a CRT that's actually usable.
I can wait. I'm in no rush, and I'm relatively patient. And it's a gift!