Here is an ALPHA version of the BesselHorn curve, as a Script. A Node could be done.
It seems to work fine in MoI Beta 5 as well as MoI4.
Clicking on a parameter label restores its default value. (Thanks to Max for technique.)
cm was used for the Units.

Modification was made to the EggOvoid script. Egg build options need to be removed :-)

Some minor cleanup needs to be done.
Limited testing done.
It may be desire-able to modify the Limits of the sliders...
Error catching for weird parameter values is not done in the script. Have not had any crash so far.
Had to "relearn" Alert coding. (Alerts are commented out.) (The Alert would not show 1.0, just 1)
Had to "relearn" method of establishing input xValue range. Method shown in comments.

- Brian

The script .js and .htm files should be placed in the MoI commands folder in AppData.
(I use Max's customUI to run such scripts.)

Revolve of the profile curve is left up to the user of the script :-)