Actually, this is more of a test run to see if this idea will work with a different, much larger project. So, yes, the small number of textboxes does look kind of ridiculous, but the small number also keeps the confusion low for me.

Here is what I have in mind.
1.)When a textbox is entered, its current value is stored in a variable.
2.)The user edits the contents of the textbox, but is restrained from entering non-integers through use of the _KeyPress() event.
3.)The _Change() event updates the above variable. In case the user pastes data to the textbox, the _Change() event provides further screening and will revert the textbox value to the value stored in the variable if bad data is pasted.
4.)In the larger project, I will eventually use the _Exit() event to facilitate immediate updating of the worksheet instead of waiting until the Userform_Close() event as in this project.