A good proposal, as usual
Mutt, and certainly achievable within one airline, albeit with 12 types. We're in a fairly similar position, with 9 types in the main airline and it's subsidiaries..
The problem arises when the system goes global, and we're trying to accomodate ALL types, from light jets through to heavy metal, 2,3, and 4 engines, 5 and 10 minute T/O Thrust limits, and widely differing operating speeds.
An example - We once chatted about Surabaya, where both of our companys fly to. The discussion was about use of Clearway, not obstacles (which aren't a particular problem there), but it's an example. If we created an "all embracing" procedure there to cover the "worst performing" type, it wouldn't worry us at all, we only have to fly 90 minutes from there to our hub, and even a hefty RTOW penalty wouldn't really matter. For you, however, with about 10 hours to destination, you'll probably be scratching for the last Kg of RTOW, and cursing the more conservative analysis for the worst case aircraft.
Perhaps the ideal compromise is to create a "Government Issue" OEISID for each runway, with individual operators reserving the right to re-develop their own procedure if the standard procedure was too limiting.
Regards,
Old Smokey
Oz-Expat, where the hell are you when we need you?