This is a known issue that "Enable Java Access Bridge" check box gets removed/disappears from the Control Panel ( Control Panel -> Ease of Access -> Ease of Access Center -> Use the computer without a display) when 64 bit JRE 8 in uninstalled even if a 32 bit JRE still exists.

The workaround is to uninstall existing 32 bit JRE and install again. The "Enable Java Access Bridge" check box will appear at the control panel after the 32 bit jre is installed.

Note that Java Access Bridge is supported for 7u6 and newer JREs, so the checkbox is expected to reappear only if the existing jre is 7u6 or newer.