"But the pool of heterosexual carriers in this country is fairly rocketing, "

It is, but only because of the influx of infected people from Africa.
That gives you a target group for highly effective, focussed intervention.
Why waste limited resources on the whole heterosexual community who are at very low risk when it can make a real difference if targetted on gay men and Africans?
You will save more lives per buck.
Isn't that what matters?