I honestly think you should try and find some 13x7J wheels on yahoo.jp with +/-0 offset, even low positive for the front. 4x110 13x7 MK2's etc are not rare to find on there anyway. With 175/50 tyres, or 175/60 if a 50 is too small you you
Would look much neater with wheels actually fitting stock-looking guards, with just the inner lip rolled (so they appear stock on the outside).
If you can achieve actual good fitment this way I think it will look much cleaner, and that way you can always change your mind later on, not having destroyed the guards.
I know you have said you don't care about molesting your car as its not original with respray but its still a very clean KE11, would be a shame for it to be cubed.