you can test it out on your existing data and see if it works well enough for you.
http://pixinsight.com/forum/index.php?topic=3195.0
Then, if you think it is OK, try it in hardware. You will probably find that low res (binned) colour is OK without drizzle - interested to hear what you think.
I think you will find that the 674 does not give you the theoretical 80,000 electrons/pixel in 2x2 bin mode, because 80ke cannot fit down the transfer registers or through the output amp. expect maybe ~40ke (possibly less) before saturation. However, the read noise should be close to normal when binned, so you still get the sensitivity advantage, even if not the full dynamic range advantage.