That has only worked once when 16yo made a slideshow presentation on my laptop to convince her father why she should get a new iPhone XD (this was some years back, she did end up getting the iPhone she wanted).
Otherwise the best that's happened is impromptu speeches.
I should actually ask them to plan a speech and see how that goes, it hasn't really occurred to me as I have audio processing issues ^_^; thanks for the idea XD
I know 16yo can write decently when she wants to, and has done a few writing exercises for me in the past and also at school when she tried it out for half a year.
18yo also turned out to be surprisingly good at essays despite very actively, steadfastly and absolutely refusing under any circumstances to do any long form writing whatsoever in the entire time he's been homeschooling (he's never been to school, and some of the fights we've had throughout history about it have been epic XD). I found this out after he started TAFE where he can't just refuse to do things he doesn't like XD (and there is also a lot of maturity and realising that sometimes he just needs to get past undesirable parts of things when doing things that he likes doing or on the way to things he wants to do)
It's difficult knowing what to do because each child or young adult in your case is different and develops their learning and knowledge at a different rate and a different level. I have a 29 year old son, completely homeschooled and he has still never read a novel through. Yet he devours technical books, small motor repairs, how to build, fix etc... reading is awesome now for him... writing is still a weak point and so is spelling. Yet he has a fantastic job, earns good money and is clever in so many other areas. So us mums often stress over issues when we should just let these run their course and time will tell. I believe that as long as a person can read and write (doesn't have to be essays and fancy write-ups) they can learn anything later on in life. Sometimes the more we push kids to do what we want them to do, the more they rebel and deliberately do the opposite. It's a fine line we walk being a mother, teacher, friend, and guide.
While I think I did learn that a bit quicker than some of my friends with similar aged kids did (and we even had an older homeschooling parent telling us pretty much the same thing!), it still took me way too long to figure that out XD