add nbsp to the last word of certain elements that you choose.

remove-orphans-es6.js

// target your items to be checked for oprhans,
// avoid header and footer areas to keep script quick
let contentToCheck = [
    '.content-wrapper p',
    '.content-wrapper h1',
    '.content-wrapper h2',
    '.content-wrapper h3',
    '.content-wrapper h4'
];

for(let i = 0; i < contentToCheck.length; i++) {
    let items = document.querySelectorAll(contentToCheck[i]);
    for(let j = 0; j < items.length; j++) {
        let item = items[j];
        let html = item.innerHTML;
        // 5 words is when we split
        if((html.split(' ').length - 1) > 4) {
            item.innerHTML = html.replace(/ ([^ ]*)$/,'&nbsp;$1');
        }
    }
}