Of course, you can just provide a code for users to run on their own computers, but don't expect that anyone will really use it (maybe just a few people here and there, I really mean it). Everyone, who is really hardcore enough to run something on their computers to obtain torrents will just use Jackett (https://github.com/Jackett/Jackett). It can search through the huge number of torrents, which no local DHT scraping/search engine can provide.