goal is to have deep cold storage and then use a software wallet (via phone) to accumulate more btc over time. as the amount builds up, send that to cold storage. then one day be able to access btc from cold storage (myself or other family).

is it possible to

1) load bitcoin core on a laptop not connected to the internet
2) create a new wallet for cold storage
3) remove the dat file or at lease the private key (make it a "watch only" type wallet)
4) get public key/address in order to send btc from software wallet
5) connect laptop to internet and DL blockchain/run node, monitor wallet balance

then if i need to move funds from that cold wallet, have another laptop that is not connected to the internet reinsert private key and move funds.

i know i must be missing something, but the hardware wallet/ multi sig stuff makes a semi complex procedure more complex, imo.