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Making a primer safe and suitable for modern cartridges can be a difficult process, but a simple percussion cap suitable for a cap&ball gun should pose no real difficulty.
The Wheel lock was not in use long enough to be properly developed. A French gunsmith built some advanced wheel lock designs in the mid 19th century. More as a challenge than for practical purposes.
He found that ignition with his wheel locks was as fast as with most cartridge arms, with little or no vibration to affect accuracy.
There have been spring piston ignition systems, where rapid compression of air produced heat that could be used to ignite a sensitive charge. The Daisy .22 Rocket ball rifle used this system.
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