Dutch 'omafiets' (grandma bicycle) conversion

[jonathan75]

Anybody got a view on how a conversion on one of these would work?

https://www.batavus.nl/stadsfietsen/Old-Dutch.htm
https://www.fietsenwinkel.nl/fietsen/-/stadsfietsen/?dir=asc&order=price

Pedal-back drum brake only, single gear, weight all on the rear, 20kgs. Not really suited to hilly Britain. I just really like the way they look.