I was thinking of getting a LogicPort, but couldn't really justify the cost for the amount of use it would get. So I got a Saleae Logic instead which has handled everything I've needed up to now (i2c and SPI mostly). But I doubt it'll be quick enough to handle this.

I've got the necessary datasheets and everything seems to line up so I'm confident it won't be necessary. There are a few examples of people doing this on the 'net, the guy I've been dealing with at Trident has also said he'll try and help out if he can.