Anything is doable, is it worth the effort?
The moment you throw a testastretta motor in the bike, all of a sudden the bikes value drops to nothing. You will have spent a great deal of money to make it work and you're gains will be pretty limited. A properly built 996 or 916 motor for that matter, will do just fine and be a direct swap.
A decent 1098 motor costs around $3k.
You'll have to modify your frame to accept the motor, mounts and cross braces will need to be altered. Unlike the 998 motor, the 1098 motor fits differently into the frame, that means the 998 airbox won't work in the xx8 bike's frame, the TB's won't align up. This means you'll need a 1098 airbox, which has different runners and henceforth, you'll have to probably make you're own air runners. I don't think the tank will fit properly because the airbox is too big. So you'd have to invent your own mounting system... PITA!
Then you'd need a 1098 ECU and wiring harness, you can't use the desmoquattro harness, you'd have to have a 998 harness, which of course is different then the 1098 one. By the time you're done, what are you achieving? It might be easier to buy a 1098 and make it look like an xx8 bike! LOL
As shitty as this sounds, you might wanna buy a 916 motor, have it built or build it yourself and live with it. Its nice to own a bike that has some value besides personal value....
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