I don't understand how your wife's needs are a factor.

Yeah, well, up yours, too!

Either you have to take it all out and find the right stuff, in which case you've not gained much, or you try to find all the right things to remove without removing the rest, a process which is bound to fail.

In either case, you do gain only needing one unit, but you'd have to have a 220 outlet to power it. In my apartment, the washer and dryer are, annoyingly, not next to each other, so non-trivial plumbing or electrical work would be required (though I do recognize that that's probably unusual).

There might also be code issues that say you can't have a water-dealing contraption be powered by 220 volts. That's just a guess, though.