I always pronounce words like "accelerate" and "eccentric" as "asselerate" or "eesentric". I don't know why but the "ks" that I hear in common pronunciation irks me. Is it correct to pronounce the c's as "ss" instead? I have heard once or twice the aforementioned pronunciation of "eccentric", but never of "accelerate".
You can of course pronounce these '-cc-' words however you like; but in most (or all) places where English is spoken, the standard pronunciation uses 'ks' (or 'x', if you prefer).
That being said, I have certainly heard the 'ss' pronunciation being used with accelerate, eccentric and accessory, so your pronunciation preference does not put you completely out on a limb.