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I think the engine is almost self limiting - it runs out of power when the intake system cannot deliver more fuel and air and the exhaust gases cannot escape fast enough - long inlet tracts and 2 valves per cylinder. The bore/strole ratio would suggest it could rev higher and with desmodromic valves there should be no issue with valve bounce, the only real worry therefore would be strength of the crankshaft, lubrication of the big ends and dissipation of the extra heat that more power would inevitably bring.
A rev limiter will not help much if you miss a gear when really going for it or accidentally change down one too many.
If it were mine I think I would set the limiter at 500rpm over peak power (just in case you encounter an opening radius corner and want to hang onto the gear rather than a) having the power cut electronically when it would be inconvenient or b) changing up whilst cranked over).
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