Would it get too absurd if it were an a cantrip at base?
Cantrip copper -> village + copper -> village market -> village lab market.
Probably.
Then it would have to cost at least $5, because Cantrip copper has been determined before to be worth $4, and this would be strictly better than that, better enough to cost $5. So yes, it is too crazy, at least if they want to keep it at $3.
Another option i thought about recently would be to swap the Spring and Winter bonuses - it starts as a cantrip, becomes a Village, becomes a Worker's Village, becomes a Village-Market. Maybe that would be better.
I think that would be much better, since it takes until Fall to stop being strictly worse than a Squire, which is pretty bad. Every official card that has a variable effect like this has a cost equal to the average value if the card's multiple effects were split into separate cards (for example, Ironmonger's effects are Village ($3 cost), Peddler ($4 cost), and Lab ($5 cost). It's actual cost is ($3+$4+$5)/3 = $4).
As it is currently, its effects are: Copper ($0 cost), Squire w/ fixed choice ($1 cost), Co0kieL0rd's Suburbia (Reactionless version, $2 or $3, probably $3 cost), and Bazaar + buy ($6 cost). Thus, it's average value is: ($0+$1+$3+$6)/4 = $2.5.
Spring/Winter switched version's effects are: Cantrip ($0 cost), Village ($3 cost), Worker's Village ($4 cost), and Bazaar + buy ($6 cost). It's average value is: ($0+$3+$4+$6)/4 = $3.25.
Mathematically, if the Spring/Winter bonuses are switched like you suggest, the percent error for costing it at $3 would be +8.33% instead of -16.67%; in other words, it would be twice as good an estimate for how much it should cost!