Hi Moritz,
Yes, certainly.
Zapier: When I installed Evernote thru Bitrix24 Market(place), Bitrix24 wanted me to use mcart.ru for Integration/Payment. After having trouble with even trying to sign-up thru/with mcart.ru, I moved to Zapier. Note: You may have to have an Evernote Pro Account (I tried to get clarification on this, but I haven't heard back from Evernote)?
So, I believe this would be the proper thread...
Step 1) Verify the necessity to Upgrade to Evernote Pro. Since you already have Evernote Pro, this Step wouldn't be required.
Step 2) Join/Sign-up for Zapier. Verify the necessity to Upgrade higher than the Free Version? If you already have a Paid Zapier Plan, I assume this won't be necessary?
Step 3) Download Evernote in Bitrix24.
Step 4) Start integrating Evernote into Bitrix24 thru Zapier.
I think this should get you going? Note: I'm not a "Techie", so I use a Certified Bitrix24 Partner for all my Development. If you have one, you may want to start using them at this point? If you don't, but can do it yourself, Bravo...I envy you. If you don't have a Bitrix24 Partner, I'd recommend you use one.
I hope this helps?