"Would this help in gradually broadening her mind further?"
You obviously have considerable personal interest in this subject and would be well read on the posts here.
The main thing is to keep a low profile and try to subtly take advantage of any opportunity that arises. There is already another woman of your wifes acquaintance that has a lover. Point out how easier it would be for her if her husband knew and approved of her lover.
Many opportunities may arise as time passes and you should be on the lookout for them. For example I have a reputation for being "broadminded and a good listener", so people talk to me about things in general.
One male friend allowed another male friend, (between girlfriends), to "borrow" his wife on three recent occasions. I made a remark that once was fine, twice was unusual but three time was suspicious. (In a jocular way). He asked why. I noticed he had a really good erection, so I said he should watch her to see if she was being given a special thankyou by her borrower. He got bigger and I encouraged the thought a bit more. I will follow this up in a month or so.
Another friends wife, an attractive 28 of six years marriage, started college a few weeks ago on a six month course for her work. She will only be home for a few weeks over xmas. I asked how how he felt about his wife going away for so long and did he think she would be a nun. He said they had discussed it and he had consented to boyfriends while she was away. (Something there for "Jim" if he is still around) Now this guy is alpha and fairly aggressive, the last type I would have suspected for cucking.
Finally, a near neighbour who was married for three years but lost his wife for the last two years to a lover, said she is asking to return home. I said that he should try to forget the last two years of regular intercourse that she has been enjoying, and accept her home. Then I realised I was talking to a well tented pair of trousers, so she may be home soon. Again, this man would be at the back of the cuckold queue if anyone asked me. I do feel a bastard at times but also feel that any opportunity to encourage a good cucking should be made the most of.