I have to say, I don't really like positive refresh powers that are only created to recover refresh. Item of Power, Human Form, Feeding dependency all have a story to tell, you approach seems like a way to minmax, and I don't really see a reason. Do you want to have more refresh in general, so you get more fate points, or do you want to spend that refresh to buy even more powers? If the first one, then you can, as cybertier suggested, easily do this with an aspect and be done with it. You can self compel a lot on that aspect and have even more fate points than a +2 power would give you.
If you want to buy more powers, what powers exactly? I am assuming more powers along the line of the ones you already have, so let's see what we can do there. Instead of 3 separate powers for -1 refresh each, you could wrap it up in ritual (psychomancy) or ritual(ectomancy), with all the perks it comes with.
Although come to think of it, 3 refresh spent is not all that much. Does the character have other powers that limit his refresh? Might be good to get a look at the whole picture, to see if there is a better way to save some refresh, for example if he already has thaumaturgy, he wouldn't need ghost speaker and psychometry, because he could easily do both with thaumaturgy.