Is There a Way to Remap Modifier Keys in a Specific Application?

[JMichaelTX]

@Gabriel_Roth

Yes, I've done that for a few tags but I keep adding new tags and
getting annoyed that they don't work like my other tags.

One approach is to use a Typed String trigger (KM Wiki), where the last character of the string indicates the tag to be assigned. Something like this:
;t\w
using the regular expression match.
The \w will match any alphanumeric character plus underscore.

Then you do a Switch or Case action (KM Wiki) based on the last character of the %TriggerValue% to select the tag to be assigned, using a Things menu item.

I don't have Things 3 app, so I can't test.