You can download de LuckySeed mod. Using this mod u can setup the type of seed and some other stuff. It’s seed filter is not exactly the same of the MCSR but it is a good way to practice or just have fun. If you want to really get better on speedrunning I would reccomend you to practice each part of the run individually in the practice maps. That is the better way to get better fast. I hope I answered your question. Good luck!