EU-OPS 1.297 (D) details the ETOPS en-route planning minimas.
No, you haven't. The En-Route alternate specified in Henrys post refers to an ETOPS Suitable airport, not a non-ETOPs adequate
5) The alternate airport is specified in the dispatch or flight release and meets the prescribed weather minimums;
The alternate YOU are refering to is a DESTINATION alternate, not an en-route one.
A company may choose to exceed the regulations in any way it chooses, but the regulations are as I and others have outlined to you.
My "10 000 Mile" Idea was correct under the regs and most airlines practices.