[Closed] Child friendly gears

Does anyone have any recommendations for a cheap solution to getting a set of SunRace gears on a horrible BSO usable by the weak wrists of my partners daughter?

Had a quick set up check of the beautiful pink full sus catalogue bike last night and whilst I understand it's limitations, I would at least like to get the thing usable!
The 6spd Gripshi[i]f[/i]ter can only be wrenched round to the lower gears with extreme effort (it's hard work for me - a 6ft something gorrilla!).

I've stripped the setup and it all runs free with no binding, it just appears to be a very hard derailleur spring coupled with little mechanical advantage at the shifter.

I notice Islabikes use SRAM X3/4 which can be had for ~£25 including a bonus gear with a 7spd freewheel, but then I'd need to add a dropout mech hanger and start messing about more than I'd like given the nature of the machine...

Has anyone mananged to reduce the effort required on el cheapo gears with a little re-engineering?