My suggestion is another.
Why does your wife does not like the idea of diving with you?
My entire life had been very different if my wife did not share my same passion for diving.
Diving together is a strong experience, it will cement your love and your affinity.
Our best moments have been diving together. Better than sex...
(well sometimes the things coincided, but this is another story).
We have been together for almost 50 years, and I do not think this could have been possible without sharing this passion together.
So I think you should explore more in detail this scenario, and if there are impediments, I think it is worth to find a way around them, as the prize that both of you will get is IMMENSE.
It is literally a thing that can change your entire life, and definitely your relationship.