So, I remembered to do some filming after yesterday's class, and my members were kind enough to assist. Here's the video:
http://www.youtube.com/watch?v=eIvsCZE7xAw
It's just ikkyo. And the only resitance here is gotai, from a static position. Of course, there are also ways to deal with dynamic resistance - i.e. an uke retreating to avoid tori's technique - but that's for another video...
In the beginning of the video, I show the turning of my hands in the ikkyo arm grip that I find quite helpful against strong and resisting uke.
Next, a few pointers on how to do it against resistance on two levels - low, at the initial katatedori grip, and high, at a shomen level. Those moments are where ikkyo is resisted the most.
After that, I do some henkawaza (shifting technique), which is the most common way of dealing with strong resistance against a certain technique - you just shift to another, where you can use that resisting force.
To me, the things on the video belong to regular aikido practice. I've done it since I started with aikido in 1972, because this was very frequently taught by every teacher I had in those days.