Spring Preload adjustment- Link Pro?

[lambretta man]

I switch from solo to two up riding quite frequently. Adjusting the stock shock spring preload is a real *****- hammer and punch because the spanner just doesn't fit or work. The only alternative I can find is a shock that provides hydraulic spring preload adjustment- Ohlins.. Expensive...

Has anyone tried the Link Pro offered by Schnitz Racing?

 

[lambretta man]

Or this tool from Race Tech- more hammering but looks effective...