[PROJ] ETRFxx to national ETRS89 realizations (e.g. ETRS89-NLD [AGRS2010], RGF93 v2/v2b, ETRS89-HUN [ETRF2000], etc.) (was Re: Time dependency in ETRFxx to ETRFyy coordinate transformations?)

[Even Rouault]

Thinking more and looking at "ETRS89-NLD [AGRS2010] to ETRF2000 (1)", I 
see it is a noop transformation, so with no time dependency...  How does 
that fit with the fact that ETRF2000 is dynamic. I see that "ETRS89-NLD 
[AGRS2010]" uses DATUM["AGRS2010 (ETRF2000)") and has 
ANCHOREPOCH[2010.5]. So I'm thinking the output coordinate when 
applying "ETRS89-NLD [AGRS2010] to ETRF2000 (1)" is at coordinate epoch 
2010.5, right?   Shouldn't the PROJ pipeline +proj=set +v_4=2010.5 ?

Same question for ETRS89-FRA [RGF93 v2] to ETRF2000 (1) and ETRS89-FRA 
[RGF93 v2b] to ETRF2000 (1) with are both no-ops. Shouln't output 
coordinate epochs be respectively 2009 and 2019 per their anchor epoch ?

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