If anybody else has experience or they know whether the amount of capacitance used in PCAP might cause electrostatic buildup and;or a spark please do let me know. Any feedback/info is always welcome!
Respectfully, I think you are missing the point by a wide margin. Your problem is not about static charges, it's about operating electrical equipment in potentially explosive atmospheres.
I don't see how a capacitive touchscreen can induce static charges on an operator. Does your capacitive-touchscreen-enabled smartphone ever do that?
One aspect of ATEX is indeed that no dangerous condition is generated during normal operation, but it is also important that no such condition occurs because of faults and failures. That is why ATEX-certified devices employ various measures, such as limiting the available energy (intrinsic safety), or enclosing the device in a flameproof enclosure - these protect against explosion even in case of electrical failures (shorts, insulation deterioration, random component failure etc).
As with anything safety-related, I recommend you read up on relevant legislation and standards, as my colleagues have already suggested, instead of taking random advice from the Internet.