Stick within the limits, and book a seat in advance so you get priority boarding. You should be fine - they are quite good at spotting over-sized bags*, so you'll likely only be asked to put it into the sizer if it is actually larger than allowed. I've done a couple of hand-baggage only trips, with RyanAir, without issue. My only concern is the corporate laptop is a bit big for the limits they publish for the second bag - I tend to put this in the main bag (inside it's light laptop-bag) and carry a separate camera bag.

* Though a colleague of mine has a bag that looks over-sized, but isn't. He loves being asked to put his bag in the sizer. Life's small pleasures...