For straight nutrients;
You could use alfalfa and kelp during veg and into the first half of flower. Nitrogen use peaks during the stretch after you flip to flower, so alfalfa beforehand will have you prepared. Some people don't like to use it after that stretch period, other people think it's OK for a little N all through flower. Kelp is good for a little K and other micros.
You can use a little seabird guano and fish bone meal sometime during the first week you flip to flower, so you have phosphorus available early from the guano and later from the fishbone. You can keep using the fishbone every few weeks during flower for steady phosphorus and calcium.
Save the langbeinite for the 2nd half of flower, after week 5. Potassium is good then, but too much too early will yellow off all your leaves.
For biostimulants, to improve soil/plant health;
You can use a little humid acid to buffer your soil pH, improve nutrient uptake for your plants.
You can use a little oyster shell for chitin to help plants resist stress and help your soil fungus.
You can top dress with worm castings to increase beneficial bacteria in your soil.
I'd work out a little rotation for sprinkling on a little of 1 of each of those every week.
