Hi,
im doing Keto + Intermittent Fasting since October to get a ~10 Kg weightloss. I usually do a very big meal which consists of about 2/3 of my daily Protein and Fat. My 2nd Meal (Post Workout) usually has a Whey Protein in it (about 37.5g) and i know that it causes a Insulin Spike which hinders my fatloss. Does anyone know if Vegan Proteins like pea, fava etc. cause a Insulin Spike like Whey/Casein?
Why do you think the insulin spike hinders fat loss?
And don’t you want an insulin spike to build muscle?
You will have to eat a lot more vegan proteins to make up for the absorption of the whey protein. Almost all whey protein is absorbed, whereas for vegan proteins, much less is absorbed.
And the amino acid profile is incomplete and not properly balanced. Eat Meat 
or at least lots of eggs 
The amino acid profile of undenatured raw grassfed whey is excellent and it’s a great source of leucine and other things of interest to muscle-builders - and any protein is going to cause a bit of a spike. Raw, grassfed Whey is Waaaaaay more nutrient dense than pea, fava, etc…
I use it for muscle food in the hours and day after an intense weightlifting workout - in a smoothie with greens and berries and cinnamon and coconut flakes (and Maca and sea salt and ground flax and/or raw cacao powder, depending on the day). 
This is the specific kind I buy, with gratitude for all the Momma Cows - and it’s a whole other planet from the nasty, extremely processed, whey isolate stuff - also is quite a good value for money when you compare it to the organic raw whey:
I’ve not really figured out a way to use it in cold weather - it can be added and blended into pan frys/porridges once they’ve cooled a little, but it’s a bit of a hassle and I use it less in winter than I should…
Also, there are benefits to waiting an hour after a workout to eat, has to do w/ amino acid synthesis I believe?