I am sure with any amount of effort something like that can be replaced, however, not sure it would be worth the time and effort.
I have an old DISA floating around here somewhere. I recall that the diaphragm housing is snapped together around it entire perimeter and may be a bit difficult to take apart without damage.
There are some things that you just do not need to spend your time on in my opinion.
Things like water pumps, fuel pumps, DISA, AC compressors, fan motors, wiper motors, MAF's and such are just consumables and if you have a failure you either junkyard some of the items, but most are things you do not want failing on you again and my be labor intensive to replace, so just step up and replace it.
The thing with the DISA removal and installation is easy and it will not likely leave you stranded unless you have a catastrophic failure and rear pin ingestion. If you could get a cheap used DISA, it is easy enough to access, it would be worth the effort to go this route in my opinion. But it is hard to say for sure how good a used DISA may be and how long it may last.