Sure you can, they are both matters of degree and scope, but I do think going to the extent of weaponizing either is at odds with the other.
For example, I don't try to act against anyone's personal sexual or romantic inclinations, and don't think it's the place for government or anyone else, that's a freedom we all should have and defend, but that doesn't mean there aren't societal or personal limits. If any of my friends were polyamorous or in a thrupple or open relationship or anything like that, it's not necessarily my business unless it's presenting problems that visibly affect their life or mine. My acceptance of that is independent of the fact that I'm only interested in a long-term monogamous romantic and sexual relationship at the moment, which has in some cases seemed more conservative. If my romantic partner decided she wanted something else, she's of course welcome to explore that on her own terms by ending our romantic relationship.
I guess the nuance really comes down to where the aspect of "morality" comes in, where it's directed, and whether that's fundamentally at odds with a sense of true liberalism.
In one instance for example, I found myself prompted to defend monogamy in opposition to someone who would clearly think of themselves as a progressive, and might arguably be liberal in disposition, but was railing against monogamy because she'd had bad experiences with the people she ended up with in those relationships. She was making a grand moral argument, and I responded with a contrary argument, but I don't think that's incongruent with either of us being liberal.