I don't shoot a ton of portraits, mostly friends and family. When I do I feel like I need to have the ability to fire off a rapid succession of shots. For what ever reason, when the subject gets in the groove, I push and push while things are right. Stopping to let the bulb cool, or slowing down is out of the question ... for me.
Golden hour shooting is fast paced, the sun fades fast, I probably wouldn't try to change gels mid shoot.
So all that colors my opinion.
"Colors", get it? lol
Anyway, I've never shot blue at sunset. If I want to bump up the sunset a little, bare flash will do that for me.
If there is no color to the sky you can shoot green and push everything else red/magenta.
Here is my gel solution with my 360, plenty of space to breathe.
I'm sure you could rig it up either to the strobe, or the inside of the softbox mount. As I said in the post, it sounds more difficult than it is.
If you can't find one, I might be able to dig up the cone template generator I used
1/4 or 1/8 sheets cut to size is my go-to option
PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20