For non-Japanese resident members you don't need a JAL credit card to enrol https://www.jal.co.jp/jp/en/jmb/lsp/...qualification/ (compared to https://www.jal.co.jp/jp/en/jmb/lsp/jgc/qualification/ )
But you need to join JGC at the 1,500 Life Status Point 3-star level - I don't think you can join or be grandfathered at below 3-star level outside Japan <-- I'm happy to be corrected on this

Once you reach 1,500 LSPs, you get a link to a web form New status programme (launching in January 2024).
My missus was enrolled at the end of the 50,000 FOPs era in Dec 2023. Already web form then. She never had the Aeon Card JAL (couldn't be persuaded to sign up for it, I ended up transferring her renewal JMB thru Bonvoy and thinking about Accor in the future) nor JAL Card (we can't get that, as overseas members). We were given 1,500 LSPs on 2024 transition.

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OP claims he can obtain JGC Premier
Obtaining JGC Premier in 2026 will not only require 80,000 FOPs, but JGC membership.
It's not obvious from here he is a current JGC member - as said above, non-resident members are generally at least 3-stars
If 3-star, OP is a oneworld Sapphire ("JGC Green") without annual renewal requirement other than to pay 2,000 JMB annually until next rule change, but he does not mention he has that. He mentions he has Atmos Gold, which is equivalent but has annual renewal criteria.
I'm not sure he understands the JGC bar to becoming JGC Premier. There is no direct conversion of FOPs to LSPs, but 1,000 sector miles (which is the base variable for FOPs before bonuses and multipliers) is 5 LSPs (so 80,000 FOPs is less than 400 LSPs...)

In contrast JMB Diamond is a superior tier to JGC Premier and can be obtained without any JGC membership, for 100,000 FOPs https://www.jal.co.jp/jp/en/jalmile/...ond_miles.html