Austin understanding consent was his character development in the first film. At the beginning of the film he did not; he was shown to be rambunctiously jumping on his partner despite her giving clear negative signals. He learns consent throughout the course of the film.

Thus, a good modernization would be for him to discover the importance of trans rights and respecting genders that do not align with those assigned at birth, over time. He would need to be misguided in the beginning and make some mistakes.

He was also very casual with sex, like he did drop a mention somewhere in the movies that, like under the sheets, he might have blown a dude. I can't remember the specific reference tho.

If you're gonna do it though, you need to pick some new reference material.

I'd go with a Pierce Brosnan 007 maybe, early 2000s, and then throw in some Tom Cruise mission impossible, maybe the odd Matrix reference. Main character spends all of their time looking cool and moody and never actually does anything while still somehow singlehandedly solving all of the problems, stuff like that.