This has gotten a large number of voles but no comment from Logos. I seriously have no estimate as to the amount of effort required ... whether it is primarily an effort of developing the highlight or whether each highlight potentially has customized code. The request indicates that there is no licensing issue but does not state which organization they spoke to.
Where we stand:
Logos

Precept Ministries International - reverse side not shown:

Precepts Camden:








Workaround 1:
There is a potential workaround if users share the load.
- images can be uploaded and centered. I don't believe they can expand/contract based on the length of a word

- straight and natural color markers are available in a limited number of colors

- the remaining symbols could be restyled to fit into Logos restrictions
Note that for a number of cases, visual filters could be designed for the highlights:

In short, we need
- to make sure there is a clear understanding of what is meant by "complete set"
- to have Logos tell us whether this is on their radar as doable
- to determine if Logos timeframe is such as to imply a user generated solution is necessary