Pages and posts both in main slider?

Hello
I am using the slider on my frontage. Currently it shows my sticky posts which I like. However I would have love to also include some of my pages, but it seems that it’s either way with Customizr. I also have a membership page – unsing Memberpress – that I’d like to feature in the slider. It doens’t register as a “regular” page, it’s under the membership tab. Is there a way to rewrite easily the code to do that (basically adding a sticky option to my membership and other pages maybe)? Or should I go for the pro version and having more than 3 featured pages…Thank you.
If needed my site is https://www.laurentlanglais.com