The problem is not so much honor as the rules being too lax. 35% NW is stupidly low to attack another fam - if it were 70% then it would be better imo. Also a fam wide protection similar to p-mode to prevent massive farming during wars could be instated.

This would sort out 90% of the whining about "honor".

The other 10% is NAP breaks / general douchebaggery which I agree is a problem that something like this could deal with.

First step imo should be to look at the restrictions in game though. There is nothing to stop farming of a fam half your size for half their planets, and in a competitive game if you're playing to win, why would you NOT do this if its in the rules, honor or no honor?

Edit: to prevent fams just below 70% from exploring into your core and portalling - let a fam declare a 30 (for example) system core at BoR (similar to the NAP agreements that was implemented recently) where they can attack anyone.