mathematically possible, so sure try it ......
I have a DeWalt DW618 router kit and using the plunge base the bit would have to extend 3 inches from the bottom of the base to make the cut. I found a bit with a total length of 4 1/2" so doable?
I wouldn't do it, there's just too much unsupported length and chances for vibration or breakage. It's also just a "weird" setup and more chances for things to go awry in my opinion, but if there's a "throw caution to the wind" in you, go for it!
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
Last edited by woodnthings; 02-23-2019 at 06:24 PM.