Post-Script: I'm thus far gainfully employed, but it nonetheless represents an interesting opportunity. There are now many such niche markets that seem to be, or are being, resurrected from the near-dead, such as typewriter repair shops. It requires, however, a prudent business person to make it work, who understands where and how best to exploit those niche opportunities and keep costs under control. There's also the consideration that a retail space is not necessarily required, especially if one partners with a storefront business such as a music store, which shares a common clientele.
Typecast via Olivetti Lettera 22.