I'm trying to match consecutive patients by fitting a Propensity Score. The treatment has 3 levels (Controls, Treat_1, Treat_2). The "MatcheIt" package, is designed to work only with 2 levels treatment. I tried with the "Twang" package, however it seems to be designed for Propensity adjusted analysis, not for matching. My outcome of interest is time to event and I need to plot survival curves and I think that PS-matching may be superior to PS-adj.