Sleeping on tummy in crawling track

My daughter (4 weeks) sleeps on a foam mat or the crawling track all day, happy as anything. At night we put her to sleep on her back in a moses basket and it’s really difficult to get her to settle after each feed.

I want to try and recreate her foam mat/crawling track environment for night time sleeping since she likes it so much, but I’m nervous about it. For example, when she spits up, her face will be right in it. And can you really keep that surface clean enough? As clean as freshly washed sheets?

The only thing I can think of is putting one of those soft, waterproof covers on it, but then it defeats the purpose of the crawling track, doesn’t it?