How To Validate If Data In A Cell Conforms To Data Validation Rules In The Cell

I have an Excel workbook which contains data entry fields, which have different types of data validation rules - like Lists, Date, Whole Number.

I do not want end users to remove these data validations as well as the formatting of these cells by doing copy/paste. So, I have implemented techniques mentioned in the following post, and elsewhere - to override the paste functionality and implement PasteSpecial values automatically.

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To keep it simple, I'm only supporting pasting a single cell at a time.

Now my problem is this:
Doing the PasteSpecial values programmatically doesn't prevent the user from pasting values in the cell that violate the data validation rules. So, I can paste a string into a cell having data validation as Whole Number, or a invalid string into a cell having data validation as List.

The following post just suggests disabling paste whenever data validation is present:
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But I would like to allow the paste operation if the value being pasted is a valid value for the cell's data validation.