The usual handlebar risers and angle plates are not going to give you that much adjustment. I have seen stacked risers, but I would not recommend it. You may find other remedies, but I believe a conversion to tubular handlebars would be the right fix. Everything on your handlebars now will fit on 7/8" (22 mm) standard handlebars. For a first-class fix, ABM makes a billet handlebar adapter for handlebars of that size. The ABM adapter replaces the stock steering crown (top triple clamp). You will need to unclip and re-route some cables and hoses, and maybe add hydraulic hose and cable extensions to get full-swing freedom of the handlebars for turning. New handlebars typically cost less than US$ 100.00 and most bike shops will let you take new handlebars outside, one at a time, to quick-check the fit for you. (A quick-check means no tools.) Tubular handlebars will give you a wide range of choices for height, sweep, angle, and wingspan. You can spend less than the ABM adapter costs, or much more, but the ABM adapter is a good look.
This is just one example, located in the UK. ABM sells on many bike shop websites, and they may sell direct to you. https://www.bikermart.co.uk/Yamaha-FJR1300-2001~12-ABM-Billet-Top-Yoke-Handlebar-Conversion