I'm somewhat similar. My DCA purchases go to my Nunchuk wallet, and when a certain threshold is reached, coins are transferred to my offline, watch-only wallet. I make seperate, occasional purchases of lightning sats which go to my Minibits wallet for use in zaps and small-value purchases. Sats I earn through zaps and thrifting & flipping also go to the Minibits Wallet. When the Minibits Wallet reaches a certain threshold, I'll transfer the sats to my Nunchuk wallet, where they sit until it's time to transfer them to the offline wallet. This process has been very helpful in maintaining liquidity, and automatically saving.