I thought that LVP's were very specific to individual airports.
Ie with these new mega high towers the airport can be in to LVP's and no RVR's being reported because the cloud is broken at 100ft and the tower can't see the runway. LVP's as such are purely a operating condition of the airport and as such have no bearing on the crew. Even if the mins are below the CAT 1 mins there is nothing stoping a crew taxing the aircraft to the hangar in 75m viz.
By holding a IR for the particular type you are deemed suitably qualified to operate that aircraft down to the minimums specified by the rating other wise they would set the minimums for that rating higher.
And there are alot of companys out there who are operating cat 1 machines and crew that SOP's allow them to do a min RVR CAT 1 departure.
MJ