You are probably right. The cost vs reward of a new lawsuit in 2025 is not convincing.
See #6. Although I’ve learned over the years to not take any SEF/AIMA promises seriously, perhaps ask your lawyer (or multiple law firms at the same time) to email and send registered snail mail to AIMA repeatedly? Offer 1000 euro or something like that if anyone succeeds in getting you a biometrics appointment first.