I have a strong feeling you will change your mind

You have three birds, your first two are not bonded (as they live separately), having three lovebirds will very likely lead to a pair somewhere, and when that happens and you see a bonded lovebird pair, you will definitely start lusting after a fourth to be a friend for the third wheel. There is just something so special about a bonded pair of lovebirds, and observing their endearing interactions brings so much joy. You will also have a spare cage, making it easier to bring home a fourth. There´s not much difference in destruction, noise and cost (except vet) between three lovebirds and four.