Where would a request button stand from a DDA perspective
This is not a showstopper. Having had to take the DDA into account as an employer, I recall that the key phrase in most of the legislation is that employers and service providers have to make a “reasonable adjustment” to support people with disabilities or other special needs. What is acceptable varies from situation to situation. It poses insurmountable problems for tourist facilities such as ancient castles and some stately homes. Or coastal paths and so on. But the courts will recognise that, and won’t be harsh if the cost of making a DDA adjustment is astronomical or disproportionate.
Only the courts can say whether a reasonable adjustment has been made, but for a railway station with 76 passengers a year, I don’t think the threshold would be too high. Positioning the request button 3 foot off the ground and again at 5 foot off the ground, together with a help button might well satisfy the courts and DDA agencies.
The sensible thing to do is to engage with charities and NGOs with interests in the DDA field, and seek their views. Incorporate them where reasonable, but don’t let the DDA block the idea in principle.