If you wanted something challenging but not quite to the level of Habenaria, perhaps something like Bletilla could be a good candidate.
Bletilla striata or
Bletilla ochracea are somewhat easy to source. They are tuberous orchids that grow from underground fleshy rhizomes. You could also try
Pleione spp. or hybrids. Just making some suggestions should growing
Habenaria radiata become a bit too difficult or frustrating for the time being.
Regarding the seeds...if they aren't dust-like in appearance to the unaided eye, they are not orchid seeds. All orchid seeds are so small they look like fine dust (at the smallest) or very fine sand particles.
The seeds of
Habenaria radiata should ideally be grown in a sterile bottle with some sterile nutrient agar and be kept under lights in a clean environment. There are procedures for doing this, but it is not a simple process.
Orchid seeds photo:
Harvesting Times of Orchid Seed Capsules for the Green Pod Culture Process