You need to refine your application process then.
If people are meeting the criteria to do the job on paper, but then in person are totally incapable, your 'on paper' system needs to be better at filtering those out.
If it IS filtering those people out really well, then theres no need to lower the bar for disabled people - either they can do the job, or they cannot.
Much depends on the disability though - a fit healthy person who uses a wheelchair is a very different prospect to someone like me, not fit or healthy, nor ever going to be, and uses a wheelchair.
It also depends on the job and I have seen many where there are elements of the role I couldn't have done, that were not ACTUALLY necessary for that role, just 'lumped in because we've always done it this way' - which is a lack of sensible thinking and not a 'disabled people aren't employable' kind of issue.
For example, I applied for an interviewed for a supermarket job - I could (at the time) sit behind a till, assist customers, shuffle clothing products around/fold jumpers, mop a spill...
I could not however, serve behind the cheese or deli or pizza counters - and the role required people to cover ALL these things. They couldn't be flexible at all, so no job for me.
It wasn't necessary for all staff to cover all roles, though I can see it is ideal if most can, but they could not flex on that, thats the way its done, tough luck, sod off.
It's been a long time since I ever bothered as I am now in the lucky position of being able to work but absolutely unemployable.
An interview system that involves a good degree of 'show us how you'd do this/tell us what you need' would be good - but where theres a culture of interviews being underhanded tricks, and employers who absolutely do NOT want to make appropriate accomodations for disabled people, I can't see that taking off.