I'm not sure I completely understand your use cases, but you could try Amazing Fields. https://trello.com/power-ups/60e068efb294647187bbe4f5
It has a wide range of customization capabilities with more being added for each new version.
This is very useful, Allen. Thank you so much!
The use case may be of interest to readers. Here's a little background ...
Thanks again for this important contribution. Sincerely, Dave Wetherow
Congratulations to @Laura Holton , our latest winner of Taco Tuesday! And thanks to @Kristjan Geir Mathiesen - Origo for sharing the picture of Taco having fun with his new friend...
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