Yeah I have heard that you should eat vegetables with high long chain fat as like you say, the high fat increases inflammatory effects of the immune system and short chains (created by bacteria for veg) reduce that inflammation.
In my reading I found that MCTs can potentially cause allergies and increase Th2 although I think this is from oral consumption as the effects happen in the intestines. It was recommended to take away from food but that obviously can cause GI issues.
If I were you
@leokitten I would purchase some regular MCT oil and use it transdermally with your normal keto meals and see what effects. If no or minimal sides then progress to using it with some carbs. I would cup my hand and poor some in my hand then apply it to my skin 3/4 times, which is probably equal to 6-7tbsps. I apply it to my torso and face and sit shirtless for a good 6hrs. Apply it 15-30mins before eating. I would also buy some C8 (in my very limited experience C6/8/10/12 containing ones cause worse GI response) and take 1/2tbsp at first but see how far you can build up to over the coming weeks, assuming of course, that it has helped you.
I am still tinkering with this at the moment as I am experiencing a little too fast GI. I think the thing with MCT is, even small amounts can cause big symptoms. You may not need as much as me however as I am eating like 200g carbs in my morning meal, with some butter and cheese, and then a fairly low carb evening meal.
If you just do 100g carbs +MCT like once or twice a week you may be filling up some nutritional deficiencies that you might be encountering on the keto diet. Hopefully if this is true it will stop your urge for carbs followed by a crash, but there is a lot of if's and but's before then. I choose potatoes because they are nutrient dense, particularly in magnesium and potassium which I find hard to get on keto. Also I have a weird thing going on with me where I have an aversion to salt despite having POTS and high salt does me no favours. I seem to crave foods with higher Mg and K.