Thanks for all the replies and suggestions (some already known to me). In the meantime, i devised my own solution to my specific problem. I put together short simple script that replaces OSM link with OTM one, when summit info page is opened in my browser. If you want to use my solution, follow the instructions below.
You will need Tampermonkey userscript manager or similar plugin for your browser. Create new custom script and paste my code into the edit box.
// ==UserScript==
// @name SOTA Summit Info Page OSM->OTM Link Replace
// @namespace http://tampermonkey.net/sota
// @version 0.1
// @description Replaces OpenStreetMap link with OpenTopoMap link on the SOTA Summit info web page
// @author S56KVJ
// @match *www.sota.org.uk/Summit/*
// @grant none
// ==/UserScript==
var links,thisLink;
links = document.evaluate("//a[@href]",document,null,XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,null);
for (var i=0;i<links.snapshotLength;i++) {
var thisLink = links.snapshotItem(i);
thisLink.text=thisLink.text.replace('OpenStreetMap','OpenTopoMap');
thisLink.href = thisLink.href.replace(RegExp('http://www.openstreetmap.org/.mlat=(.{1,8}).mlon=(.{1,9}).zoom=14.layers=M'),'http://www.opentopomap.org/#marker=14/$1/$2');
}
Save, test and enjoy.
Works with Tampermonkey in Firefox on my Windows 10/7 machines and Android phone and tablet.
