Thanks, I'll be sure to peruse your community and absorb your tips!
I must say though, seeing 'Japan' and 'sim card' in the same sentence gives me nightmares... so glad we have esims/global sims now and don't have to deal with the 'tourist sim' nonsense.
As a comparison, I checked the esimplus plan for Indonesia (where we are currently... hi from Balikpapan!) . 15 gb for 30 days costs 2245jpy. On esimdb.com I found StellarSecurity has 10 gb for 1.70eur, which is what I'm using now... I know the yen is in the toilet at the moment, but that's still only 304jpy.