Hi Dave
With all due respect to whoever wrote your postP, writing G43 Zfeed start height Hnn is just plain obscure.
I know some manuals pack up instructions from different groups - maybe to reduce the number of lines in the program, but today there is no justification for that. The Haas manual uses G43 H01 Z0.1 M08 (M08 = coolant on) as an example, but it is not clear whether the Zn is applied before or after the G43 H01 is applied.
Well, you could just filter out the entire G43 line and optionally leave the Z bit in.
Cheers
Roger