I don't think LIR is going to deploy as a standalone Regiment, at least not for decades. Like you said, not enough enablers. What it will do is take managing the GRTF tasks, which are markedly different from FG for the NATO Bde, and have a HQ manage that directly. Having 3 BNs is efficient as CA MRP is designed for 1 on task, one on build, and one on reconstitution. It's actually better than MRP for the CMBGs that have absolutely no reconstitution time and the short-handed enabler trades will be driven into the ground in a few years.
Isnt the LIR only going to be deploying company elements as they LIB are currently? If so 6 rifle companies in 2 battalions with ats and dets should be enough.

