Uhh...
... AEG launched a heatpump-combo here in Germany recently. Price: round about 1500€...
I would take a big LG washer (27"). Then, I would offer a vented 240V version, a condensing 240V version and an option to rewire it to 120V. Than, I would take a usual washer, hardmout the pedestal and place all heatpump components in the pedestal with a door for a lintfilter. Of course, this would have to run at 240V to get a certain power.
And, last but not least, I would limit all dryingtemps to 150-155° F. Combos run way to hot IMO.