Police report after leaving Japan

Hi all, I left Japan, specifically Tokyo, and am now applying for new roles in the UK, and I need a police report for my DBS (like a background check in the UK).

I tried to fix it while still in Tokyo but they said only an organisation can apply for one, I can't get one "just because". I asked my new employer if they knew anything about it and they said no, and a quick Google gives me this link https://www.uk.emb-japan.go.jp/itpr_en/index_000078.html

Which honestly seems pretty convoluted. Is this really the only way to get a police report to allow me to keep working?

Can't my new employer request one somehow?

I'll take any and all help, sorry if this is a dumb question.