I was working on aneutronic fusion for some time: my feeling is that there is a lot of research to go before we can know if it's even feasible; even then unless there are breakthroughs it will be difficult to do in small reactors. There are significant thermodynamic barriers to be overcome e.g. Todd Rider's thesis (I believe they can but they're difficult -- almost like no-go theorems for fusion).<p>As for whether one could do an economic study, I believe at least one could lower bound the cost, using the cost of the balance of the plant (steam generator, heat exchangers, cooling towers) and an expected cost and lifetime of the various structural and shielding materials.