Yes buzzerbeater, was developed even with the help of hattrick so there are similiarities, but:
1. buzzerbeater ist not looking like hattrick, concentrating on 1 important skill on every position and 2-3 less important skills. here every skill is important everytime, and each position has several mainskills. So just focussing on 1-2 training types isn't that effective. When you go for training guards, you should train Jumpshot, Pressure, Passing, Outside shooting and "1 on 1" or handling(normally i would say 1 on 1 is the better choiche, but single position trainers could gain benefit from the handling training for boosting driving and handling.
2. mostly your first pick matters, it is rare to get good player in second round outside of bot leagues. Since your league is active, and you are quite late on the draft i wouldn't invest just 10k(since i believe your opposition isn't that experienced, and will make some bad choiches or low information picks). the strategy then depends also on how much point you have at the end of the season(how much do you have right now?).