I have a beta version of MapPress that will allow you to use SVG icons. I’m not sure it’ll meet your needs, but please send me an email if you would like a copy to test.
The new version includes the change shown above, but it also has some limitations:
– SVG icons are always rendered as 32×32 img tags
– Rotation, color changes and scaling are not possible
– The icons seem to work in IE9-11. They do not work in IE8