How to clear page cache without rebuilding other caches
You can use Flush Page Cache or Cache Actions module.
See if either of them solves your problem.
Flush Page Cache:

Easing the pain when you need to flush...Drupal's cache.
Flushing Drupal's cache on a large site can feel like you're waiting to takeoff on the tarmac at JFK. The delay comes from the fact that when you clear Drupal's cache, it clears everything. Most of time you just want to flush the cache for specific object on a page.
The Flush page cache module solves this problem by flushing only the cached objects for a single page. Additionally, you can define custom objects and cache tables to be cleared on specific pages.

Cache Actions:

Cache actions provides rules actions for clearing drupal caches.
It currently provides actions for:

Clearing Drupal cache bins
Clearing CSS/JS cache
Clearing The cache of specific views
Clearing The cache of specific panel pages
Clearing The cache of specific mini panels