After years and years I have yet to see that work.
Let's go a different route.
Put the hard drive into some USB hard drive enclosure and you'll get this done and spend less than what you proposed.
I have an Acer Aspire 7540 laptop with USB ports but no Firewire, no Express Card, no PCIMAI slot (or whatever it's called) but I need to connect a Firewire external hard drive. I understand that there is no way of converting these through a hub or directly so I thought maybe I could install a USB to ExpressCard slot like here:
And then plug in an Express Card Firewire slot like this:
Will this work?
The reason why I'm hesitating is that the USB to ExpressCard thing says it will only work with USB Express Cards, so does that mean plugging a Firewire ExpressCard adapter into the USB Express Card thing won't work?
Sorry but I'm very confused about this.