The methods mentioned previously using just the rope and draws are simpler and require less special material (120 cm sling, random lockers). It's also more redundant (a single 120 cm sling is not redundant).
Moreover, you say that there is no need for limiter knots, because the bolts are bomber. If you clip two bolts, you assume there is a chance of one of them failing (ignoring the overkill equalization factor). Yet, you say there is no need to tie limiter knots whose sole functions are to help out when a bolt fails.
Why the discrepancy?