Using a shortcut the extension could be done like this in a js file:

odoo.define('web.aek_shortcuts', function (require) {
"use strict";
    var core = require('web.core');
    var FormView = require('web.FormView');
    var common = require('web.form_common');
    var _t = core._t;
    var QWeb = core.qweb;
    var ctrl_count = 0;
    $.ctrl_bind = function(key, namespace, callback, args) {
        var ev = 'keydown.'+namespace;
        $(document).on(ev, function(e) {
            if(!args) args=[]; // IE barks when args is null
            console.log(e.keyCode)
            if((e.keyCode == key.charCodeAt(0) || e.keyCode == key) && e.ctrlKey) {
                callback.apply(this, args);
                return false;
            }
        });
    };
    $.ctrl_unbind = function(name) {
        var ev = 'keydown.'+name;
        $(document).off(ev);
    };
    FormView.include({
        init: function(parent, dataset, view_id, options) {
            this._super.apply(this, arguments);
            this.rendering_engine.handle_common_properties = function($new_element, $node, InvisibilityChanger) {
                var str_modifiers = $node.attr("modifiers") || "{}";
                var modifiers = JSON.parse(str_modifiers);
                var ic = null;
                if (modifiers.invisible !== undefined) {
                    var InvisibilityChangerCls = InvisibilityChanger || common.InvisibilityChanger;
                    ic = new InvisibilityChangerCls(this.view, this.view, modifiers.invisible, $new_element);
                }
                $new_element.addClass($node.attr("class") || "");
                $new_element.attr('style', $node.attr('style'));
                if($node[0].tagName == 'PAGE'){
                    if($node.attr('context')){
                        var context = JSON.parse($node.attr('context'));
                        if(context.shortcut != undefined){
                            ctrl_count++;
                            this.ctrl_count = ctrl_count;
                            $.ctrl_bind(context.shortcut, this.ctrl_count, function() {
                                $new_element[0].children[0].click();//could be used execute_action() too
                            });
                        }
                    }
                }
                return {invisibility_changer: ic,};
            };
        },
        destroy: function() {
            $.ctrl_unbind(this.ctrl_count);
            this._super.apply(this, arguments);
        },
    });
});

<notebook>
    <page string="Tab 1" context='{"shortcut": "Y"}'>
        ...
    </page>
</notebook>