You can make your own seedsigner from off the shelf parts. No need to give your mailing address to a company which can be leaked, exposing you as a hodl'r. This has happened.

I know right. Hardware wallets are more then fine if you know which ones to buy. I just want open source and air gapped.

I'll be getting the coldcard mk4 using it with nunchuk on my phone, using NFC to sign the signatures.