^
as the first reply person said. They could balance it with 2 systems :
1. The stat of that gear could be different alternative of the same level so that players want to do both.
2. The drop rate will have to be low. Similar to FFXI or 1.0 content where there weren't any lock out.

Basically, you could run Coil with your static, and farm something else with other friends in non-lock out raid.

Or, simply release them on different patch, lock out one first patch, and no-lock one second patch as my first suggestion. This way end-game players were already have lot of their gear from lock out 3 months, and can still farm alternative choice of gear in another patch. Not just only vanity gear with low level and easy content such as now.