I don't think that's something you can really do with voting systems, though. Lots of voting systems are based around the same input assumptions, i.e., people are submitting a rank-order of preferences. And nothing's saying you'd have to switch to PLACE from STV rather than from FPTP. Regardless I think it doesn't make a lot of sense to associate ordinal ballots with STV specifically rather than just, well, what they are, which is a rank-order of preferences, that will get used somehow.
You can sometimes, you can't others.
> Lots of voting systems are based around the same input assumptions, i.e., people are submitting a rank-order of preferences
But FPTP is not based on that input, so changing from FPTP to a more proportional system (many of which rely on that kind of input) provided a clear opportunity to have a clean break without false familiarity.
> And nothing's saying you'd have to switch to PLACE from STV rather than from FPTP.
The false familiarity is FPTP -> PLACE.
When you are changing how ballots work, this should be unavoidably obvious, even to people who spent the time the change was being debated in a coma or Antarctic research expedition.
Also, STV in small (~5 member) districts gets much improved proportionality from the status quo, keeps geographic districts, and increases the proportion of people with someone representing both their ideology and district simultaneously.