can I still be poly if I want to have a couple of intimate (kissing etc but no sex because I’m asexual) friend-/relationships without them being a real relationship with commitment and stuff?

Sure, you can still identify as poly. You’re the final arbiter of your own identity. 

It’s important to remember that identity terminology isn’t a secret password into some exclusive club, nor is it some black-or-white deterministic label. 

It’s more important that you have healthy, fulfilling relationships than that you find all the right collections of syllables to describe how you prefer to have relationships. The point of identity terms is to help you better communicate to yourself and your partners how to cultivate healthy, fulfilling relationships. So words are only “accurate” inasmuch as they are useful to you when building a healthy, meaningful life and community. 

Go forth and identify!