Hi Nina,
How fun!! I love kitchen experimentation!
Right now, I'm also doing the overnight rolled oats (but the old fashioned longer cooking type). I add in dried fruit (fresh if I have any) - sometimes also overnight if it's of the sweeter variety, like raisins.
I always put in a good scoop of either fresh ground flax or chia for the EFAs - and this might help it satisfy longer, as well as either soymilk or coconut milk powder (post cooking). I used to add in some nut butter (also after cooking) that had quite a bit of staying power, but since I've started doing some long rides in the morning, I've been leaving this out - just too heavy for the activity.
Back in the day, I used to cook up quinoa every morning instead of oats, and I remember it kept me going for quite a while. As I recall, I added in EFAs back then also (but I'm pretty sure at that point I was using the straight-up oils - a Tbsp of flax/chia/hemp oil), along with some nut butter and I may have added in flax meal on top of that.
It's kinda funny - I recall that I was taking my requisite nutrition class at the time and I broke down the caloric content of that breakfast I used to make and it came in at around a thousand kcals!! I must have needed it at the time, as I was commuting on the bike constantly, but that seems a bit too heavy of a breakfast for me right now. That said, I usually have a second breakfast after my ride these days … and I have no plans to calculate the kcals for the current intake - too busy with herbs now! :) Besides, there is much to be said for the more intuitive approach to eating.
Anyway, thank you for sharing! Hopefully there's something helpful in my rambling for you also.
I am SO looking forward to trying those solid extracts - and that sounds like a fabulous way to add it in!
Cheers and blessings,
Shana