As SkidT suggests the 756 Road High might be your best bet for replacement bars but you will need to factor in the additional costs of new bar ends or preferably tapping out the bars to take the OEM bar ends which are heavier than replacements which reduces vibration. Bar risers would probably be your best bet and work out cheaper and simpler to fit in the long run, and if they don't work out you could easily return them for a refund within 7 days.
Link to generic risers on ebay £16 (UK seller 30 day returns).
Link to risers that also pull the bar back towards you on ebay £25 (UK seller 60 day returns)
Link to generic risers on ebay £16 (UK seller 30 day returns).
Link to risers that also pull the bar back towards you on ebay £25 (UK seller 60 day returns)