Considering the economic viability of replacing a conventional automatic transmission with an HSD system as Toyota is doing on some of its models, to the point of doing a full-hybrid approach to some models including the Lexus range on many markets, it seems quite easy to make an off-the-shelf EV powertrain. The space saved from the eventual absence of an ICE could be repurposed for a pack of batteries.
The fact that some 48-volt alternator-starters fitted to modern BAS-Hybrid vehicles having more torque than mid-size Euro cars such as the Opel Vectra A used to have about 30 years ago, and across a broader peak torque RPM, is also noticeable.
Now taking as an example the Suzuki S-Cross, even though the power rating for the ISG alternator-starter while serving as an auxiliary motor might seem negligible, it's worth to notice most vehicles don't need more than 15 or 20 horsepower to retain a constant speed even on road traffic, then with the available CVT a full-electric version relying mostly on parts already available could be eventually realistic and decrease development and manufacturing cost.
Even though EVs are not really my cup of tea, I believe it's not rocket-science to provide a more affordable approach for those who are comfortable enough to get rid of the ICE.