I've successfully done this once, and used the complete opposite approach. I had a 2" who's gold stripe had just started on his head, I'd had him for about a year flying solo.
I added a large 3.5 - 4" GSM. Upon introduction the male swam right up to the female and began twitching. The female pretty much ignored him for the first day. Within the 3rd day they were inseparable.
I may have just been super lucky with the pairing but it was the easiest pairing I'd ever done. One day I think I'll try this method again.