Why not a burner phone?
An RFID chip implantation?
$25 burner phone, and Feds would probably get a volume discount:
https://www.amazon.com/BLU-T276T-Unlocked-Dual-SIM-Camera/dp/B00O5EU9JO/ref=sr_1_10?qid=1649367719
“An RFID chip implantation?”
And about 3 to 4 ounces of C4.