The problem with specialist kit is it tends to have specialst price tags. I found one easily on google but it was american and cost around $125 which seems a tad steep.

So, this is going to sound a bit odd but you could look at a nostromo n52e pad.

http://www.kikatek.com/productinfo.php?productsid=17065&source=froogle

I know that there are a lot of keys that are unavailable to you, but the pad is completely configurable and on my one, with just thumb and finger (which I can't recall if thats your index or your fore finger), I can reach 5 buttons comfortably with the finger and the thumb has access to another button as well as a 4 way rocker switch (it states its an 8 way rocker but the fine tuning for that 8 is too fiddly for me - 4 is fine). I have pretty small hands so you might have a better reach than me.

In theory not only can each key be given a different use, but macros are possible (ie combination of keys tied to one key so Shift and another key can equal one press on your nostromo). I should point out though that I've never used the macros nor any other of it's vast range of variables - mostly cos I can never remember beyond the normal jump, duck, run keys kind of thing.

http://www.belkin.com/uk/IWCatProductPage.process?Product_Id=393402

Now, I should warn you that some people really can't get on with these pads, they try them for a while and then swear never to touch them again. Since I started using one I like it for all fps games I play. Between a nostromo and a 4 button mouse I've got ample control. You'd obviously have to use more combinations and I suspect it would be fiddly - difficult to get the usual forward back left right motion to fit in easily. But as Pig says, depends what games your interested in.

You could of course wait till your fingers have recovered from their fight with a lawn mower,it has been a fair few weeks now since the mishap so see no point in buying hardware which will only have a limited use to you.