Create barbells and plates and find out which plates you need to put on the bar.
You maybe have an uncommon barbell in your home gym, an heavy loadable dumbbell, a loading pin; just create a custom bar and easily find which plates you need for your target weight.
Same goes for your plates: you maybe have some concrete/water/sand filled plates or whatever kind of additional load; just create a custom plate by giving it weight and hole size.