If anyone can do it, you can. The harp only needs five hours a day to practice, at most, and the voice probably no more than two, plus studying texts. You could vocalise for an hour in the morning, practice harp for two-and-a-half hours, have lunch, a nap, sing for an hour, do another two-and-a-half hours of harp, then call it a day. It doesn’t leave a lot of time for networking, but if you have management to handle that, it could work. I would love to see you play the solo from Lucia then sing the aria. I think it would be a tremendous attraction. How is your voice? Does it have an exceptional color? There are an awful lot of sopranos out there. Or is it in a special fach? You could always do a night club act with singing and the harp, or specialty concerts. Yes, it could be done.