Well if you "Really" liked the Universal audio sound, seems to me that would be the choice.
I'm with you on chasing the 1176 sound.
I just got a Purple Audio Action 500. I was stoked to test it out but it will NOT work in either my API 500 8b, or 6 b rack.
Seems there are some issues with the 6 pin that cancels out compression on my racks. Maybe because my racks are a bit older???
Anywhoo, if you've got the sound your looking for, man just get the UA and be done with it.
I have to sell the Purple audio and wait till I get the coin before I can here what "All Buttons In" sounds like. Obviously there are issues with Non API comps in my racks so I'm going 19".
Here's another couple options that intrigues me.
https://reverb.com/item/4736112-revi...fet-compressor
https://reverb.com/item/3815902-revi...fet-compressor
I think Revive audio offers an Mod for your Warm, not sure the price.
Good luck on your 1176 quest my man, I'm in the same boat too!