Except it’s not security of course; the difficulty in obtaining hardware is a large reason as to why industrial control systems had such abysmal security for as long as they did.
Bold of you to use past tense there
Either your customer would disagree with the premise of the standard implementation being "insufficiently secure" or your contribution to security should be reviewed as an evolution to the standard.
Result: Security is not being questioned in this realm of commercial discussion.
its a soft target. US telecom has habitually revealed their almost contemptuous disinterest in security and rely almost entirely on price barriers or law.
It would be trivial to pivot your narcotics racket to digital for only 9k or your online ransomware to LTE snooping.
[edit to add] https://www.ettus.com/all-products/ub210-kit/