Well, you get high marks for deter,ination.

Once more: get an/some ISP chip(s). The chip you are making the programmer for will in all likelyhood be discontinued soon.

A "troubleshooting with voltmeter" trick that may help you.

Somehow make the code run so slow that the highest frequency is 0.5 Hz. That way you can use your VOM as a 'scope'.

Erik