Is there a supported way of doing this?
So far there is no other way to achieve this. Interesting tags are used to color the questions on the client side in all question lists and to filter them in the unanswered my tags list. If you do not have interesting tags set, my tags will use the tags you answered to.
You can obviously also search for the tags using normal search in SO/SF/SU. If you have a long list of interesting tags, this gets tedious though.
There is a reason for this: SO/SF/SU and even meta want to encourage you to answer questions. Obviously you will do that in your field of interest most of the times, but you would miss many questions that you have a valid and great answer to outside of it. Even if it is only for somebody using the wrong tags.
If it were to easy to only see the newest questions in your field of interest, people would resort to that view as default and much would go unanswered.