你是指副词修饰accustomed表示“程度”吧！好像用于修饰accustomed表示程度的副词比较少，偶尔见过用well修饰的。

查手头的一些资料，不同的书上提到accustomed 可受fully, quite, well等副词的修饰。但除在词典上查到一个用well修饰的例句外，没有找到其他修饰语的例句。

He was well accustomed to hard work. 他早已习惯了艰苦工作。

但BNC（英国国家语料库）倒是查到有相关用法：

She knew it, and had become quite accustomed to the adulation it inspired.

Thank goodness we had tutors who helped us to some extent and who seemed quite accustomed to listening to tales of woe.

Joan, though Anne's junior by a year and not yet fully accustomed to the ways of the nobility, was by far the more worldly-wise of the two.

但语料库的例句并不一定是规范英语，仅供参考吧！