I took the following from the rtl.css
and applied them via Magic Widget with additional !important
keywords to an English site:
body:before {
right: 0 !important;
left: auto !important;
}
.sidebar {
float: right !important;
margin-right: auto !important;
margin-left: -100% !important;
}
.site-content {
float: right !important;
margin-right: 29.4118% !important;
margin-left: auto !important;
}
.site-footer {
float: right !important;
margin: 0 35.2941% 0 0 !important;
}
This seems to work, even when you scroll down.