Have stayed at Namuto twice (August both times). Brilliant - all directions, all conditions. While I have not stepped foot on Tavarua, what I'm told (and observed) is that it does not have a sandy beach, and the only safe access for kite launching (on the Nth end of the island as I recall) is tide dependant.
If you have mates staying at Namuto, you may be able to have them convince Scott to look after you (once or twice)... but remember what you are asking him to do is put his resources and time on the line for no charge - he is paying for his men, boats, insurances etc etc to look after his clients... so be mindful of what you are asking.
Upside of Tavarua could be if you get the right conditions, kite across to Cloudy and back.. but remember conditions need to be right for launch and retrieve ! (or Namuto and back - its only a couple of K's)
From Namuto, a number of times have done boat launch at Cloudbreak, and kited back Namuto via Tavarua. One session at resturants at the top of the tide and mild conditions -low tide is really risky.
Here's some videos with go pro in the canopy (on very mild days)- you can see Tavarua in the back ground on the one from Namuto,, the Cloudbreak tower and Tavarua briefly on the return from the boat launch.