The Saints Gang Styles are a little tricky to mod because of how they're hard coded to be swapped in-game by the Gang Customization system. You can't just edit their "_pre.xtbl" file to use another character and have Cutscenes and Action Nodes work.
The only way is to trick the game into thinking that it's still loading the 80s Gang Style models, but it's actually something else. ie; You need to rename all the files for the character you wish to replace the Gang Style with to match the file names of that Gang Style.
Because character Variants are often unnecessarily specified in cutscene files, the replacements won't work with Vanilla cutscenes because the names of the Variants in their .cvtf files are different to what's specified in the cutscene files. Cutscene Patch gets rid of those Variants specified in cutscene files for Saints gang members, so replacements should work without needing to edit their .cvtf files.
Yes it is bloody complicated. So, here you go. I've also renamed the Variants so they should work with Vanilla cutscenes too, and I've included versions of the .cvtf files which don't use the bike helmets. Enjoy!