Generational ID for mericlones?

[Fairorchids]

When dealing with seed grown plants, we identify generations with F1, F2, etc. Example:

Paph Hellas 'Westonbirt' is an F1 (original plant, first generation seed grown).

Paph Hellas 'Sunset' is an F2 (from selfing of 'Westonbirt').

If we selfed 'Sunset' (or crossed it with 'Westonbirt'), we would produce F3.

I have seen the 'F' designations used for meristems in the Cattleya group, but wonder whether that is a correct use?

This propagation method is different. It would be nice if we could identify whether a given plant is a meristem made from the original plant, or from a meristem from a meristem (perhaps 2 or 3 times over).