Hi Tim,
I'm having a similar issue, did you find a resolution?
Thanks.
Helen

You can use the following JS to implement it:
Qualtrics.SurveyEngine.addOnReady(function(){
that = this;
var init_ques = this.getQuestionTextContainer().innerText;
this.disableNextButton();
this.questionclick = function () {
var a = that.getSelectedAnswers();
var ch = Object.values(a).reduce(function (a, b) {
return a + b;
},0);
if(ch >=3){
that.enableNextButton();
that.getQuestionTextContainer().innerText = "Okay to proceed";
} else {
that.disableNextButton();
that.getQuestionTextContainer().innerText = init_ques;
}
} 
});

Demo here.

Thanks Ahmed!

Hi Ahmed,
Can you help me!
I have a matrix multi select question and scale options are getting piped in from pervious question. So scales are dynamic in this case. I wish to have a validation such that. I need to force at least- selection per scale/column. And if statements remain unanswered that's alright.
I want to have validation based on column and not based on statements i.e., rows
Waiting for your response