How to raise handlebars? - way beyond spacers LOL

[hilldweller]

Hi there all you bike experts. I'm going to discuss this with lbs obviously but would be interested in your thoughts beforehand. Had a session with a physio yesterday about shoulder/neck pain that kicks in after about 45mins on the bike. The problem is with the body, not the bike, and is going to require some concerted effort over a few months to build strength and correct some postural issues - apparently I'm supporting my upper body with all the wrong muscles. In the meantime, however, the physio wants me to raise the handlebars by several inches so that they're up higher than the seat. It's going to look and feel pretty weird, but with luck I'll be able to slowly ease them back down to where they should be.

So anyway, the current set-up has spacers that allow for only about 3cm of movement up or down, and I already have a stem that tilts upward. What are the options for raising the bars on a roadbike further so that I sit more upright? The bars themselves are fine.

Any advice would be much appreciated. TIA