What is the standoff (cavity height) under the PLCC?  Bypass caps up to 
.22uF (.1 uF is virtually the standard) for DRAM PLCC and SOJ packages are
available < .025" thick.  These are made by the millions weekly in a couple
common (0805 and 1206) sizes and dielectrics (Y5V and Z5U) by Murata-Erie, 
AVX/Kyocera, Samsung, Johanson Dielectrics, Novacap, and sevaral more
companies.  

I hope this helps.

Tracy Tennant