Its such a shame Android's backup/restore is such a mess, even more so in GrapheneOS. I remember the era before Google and manufacturs started cracking down on bootloaders and custom ROMs - I used an app that could do effective, actually full backup and restore in single click.
Then have some planned means of restoring the backup when it's safe to do so.
Being caught with a honeypot looks much worse than being caught with a new phone. You can always say you bought a cheap "travel" phone if asked.