Disclaimer: I know nothing about a KF2.

I would think that if you are retrofitting the spars with I-Beams there will not be a manual that applies as a cross-over so you will be on your own for the differences.
The KF7 manual has clear instructions in the wing assembly supplement on how to install the inserts.
You could use those as a general guide and translate intent to the KF2 which would allow you to determine insert setback and locations for struct attach points etc..
The inserts themselves are not difficult really. Make very sure they are rounded and polished perfect as well as lubed. Getting them stuck in the spar would be a very bad day.
You could pull the pages you need from the online manual on the KF site. Send me a PM if you need something specific.