The conservative platform in the US doesn’t exist. At this point, conservative is a bucket term for, “not progressive.” Most conservatives are on the right, but not all. Most conservatives are Republican leaning, but not all. Most conservatives are opposed to socially progressive change (e.g. expanded LGBT rights) but not all.
Basically any policy position you could point to will fail to capture a significant number of modern conservatives.
There are valid concerns with regard to bidet use. They do result in aerosolized particulates in greater number than results from wiping, which means you are literally breathing more feces.
Is it enough to be problematic? Probably not, but that may also depend on how aggressively/frequently you use them.
See also: