I can't see the point in raising the compression a point and a half or so. It won't net much power gain, and it will require premium fuel unless you plan to re-engineer the combustion chamber. Cams, valves, etc, will only move the torque higher in the rpm range, and this engine is undersquare to start, so there's not a lot to be gained by spinning it faster.
The biggest determining factor for producing hard parts is market size. If the market is big enough, parts will be made. If it is not, there won't be anything but custom parts available, and those are stupid expensive for daily driving. The only way custom parts make sense is if you are competing in some kind of series and you really NEED to win.
FI is really the best thing to do to it unless you don't mind carrying a bottle of N2O with you.