If you do not plan to spend a large amount of sats over LN, then I think accumulating few sats over LN from SN, nostr and other sources, will be OK to use any custodial LN wallets that will not bother you with channels management.

I wrote this guide for example, describing how to do it: https://darth-coin.github.io/beginner/getting-started-stack-sats-en.html

Basically you just accumulate few sats, little by little and once the amount is considered enough to be converted into a good UTXO, just swap it out into your onchain cache or cold wallets.

THERE'S NOTHING WRONG using custodial non-KYC accounts for that. The amounts will not be anyways so significant to affect your finances and also you are not touching your cold stash.

Keep it simple guys!