New or modify existing bike

KNOBBY

New Member
Hi
I am 75 year old man and getting fed up with peddling. I have a Giant Halfway which I love. Nowadays it is used just for exercise, every day, around the park or about half an hour along the beach cycle way.
This is my third folder, the other two proved too attractive to theft. Folders are just too easy to walk away with.
My options are to buy a mid-drive or buy a new bike The only mid-drive kits I have seen are in Australia (Solar drive) but I guess Bosch have one suitable.

I have modified the gear set on the Halfway to give a slightly higher top gear on a 7 spead. At only 5ft 6 in. I like the size but struggle more than 3 miles against the wind.
Any suggestions would be welcome
Knobby