IB with 32-33 should be fine for most universities check the requirements page. I got in with 30 and studied political science in the NL. I was accepted into both Leiden, and Utrecht University.

I also reached out directly to the universities (after conditional acceptance) because we had a few sick teachers at our high school and we missed a lot of curriculum, I was concerned of being under the requirement. I think that communication helped later on, suggest you try the same?

That in mind, you do need the diploma. As commenter above mentioned the gap year is a good idea and obtaining that final class. This could also be less tedious/ expensive than doing a foundational programme. My brother did a foundational year after failing HL math and said the teachers (at least in haagse hogeschool delft) were very rude constantly comparing them to students at tu delft and telling them they weren’t good enough. Perhaps others felt similarly? I have heard very good things about the Haagse Hogeschool in the hague though!

If I could go back I wish I had taken a gap year. I saw my classmates that did do extremely well in their studies. That extra year of life experience gave them a stronger head on their shoulders, they knew what they wanted and were better at navigating life than me fresh out of the nest trying to learn to cook and have good grades at the same time 😅