I have not worked with your instrument nor your tripod, but based on my experience with other instruments and legs, I think you can unscrew the tripod screw from its toggle easily.
From that point, it becomes a matter of replacing the screw. The question becomes one one-time-only or repeated use over a longer term.
For one-time use, a 1/2-20 capscrew of suitable length should slip through the internal thread in the toggle. It wouls be a good idea to put a washer on the capscrew, and a deep socket gripped directly in your hand will provide more than enough torque to lightly snug the capscrew.
If you are looking for a long-term fix, you could either replace the toggle and retainer screw having a 1/2-20 thread, or screw a suitable threaded rod into the instrument base, to be used with the original toggle, a 1/2-20 wingnut, and washer.
It would also be a really good idea to chech, and correct as needed, the adjustment of all instrumeny's level vials. The bubble-checking process is commonly called peg testing, and while there are several variations in the process, I prefer the method Wild / Leica describes in the manual for their NA-2 automatic level EXCEPT for a non-automatic level the adjustment is performed by pointing the instrument to the calculated ros reading and then adjusting the vial, NOT by adjusting the reticle.
Or, the simple alternative to checkin and adjusting the vial is to locate the instrument so that all shots taken at the setup are at the same instrument-to-rod distance
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