Then instead of running their own obscure and non-viable candidates they agree to support one of the main party candidates, but only if they meet some minimum requirements regarding support of libertarian and/or conservative issues.
This way libertarians and conservatives won't have to financially support the Uniparty, but they can influence it by giving or denying their support to the better Uniparty candidates.
That pretty much describes NY state politics with both a conservative and liberal party which usually but not always has the same candidate as the respective big dogs