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@DaveNI
Thanks - that sounds perfect! I'll try it out this evening and may write a completely new ILI9341 module which is backwardly compatible with the existing one but doesn't use any callbacks.
Setting the background colour could be an issue but I could query the display to get the existing background (probably just one pixel needed assuming the background was from a simple fillRect).
The SPI speed should be the only bottleneck now - clear() takes a second or so but then that is 320 * 240 * 16 = 1,228,800 bits!!
An option when initialising Graphics would definitely be cleaner (some day!) but your suggested method should have very little impact on performance.