Strands use a two-speed motor. I have read that a VFD won't work for both speeds of the two-speed motor (happy to be corrected). However, being able to vary one motor speed, plus use the gearbox, you should still be able to cover the range.
The Strands motor is like a lot of Swedish drills, vertical shaft, "upside down" and built-in to the gearbox casing. Being a "special" motor, be careful. Moonlight machine, is your machine running a VFD?
We have a Strands 25 at work, it is an economical, light, basic model, well made, no problems over about 20 years. It doesn't have a quill stop directly on the quill, there might be one on the quill handle shaft, but it has never worked. Annoying. It doesn't have a measuring scale direct reading off the quill, it has a graduated collar on the quill handle. I don't care for either of the above, but it still drills holes. No power feed on ours, no big deal as it is mainly used with a drill chuck and we have a larger machine as well.