Use https://www.walletofsatoshi.com/
It's a custodial wallet so don't leave your funds on there for long but they do the entire back end for you.
You can send lightning to it and then send the funds to any segwit address you want.

Yes, in theory they could implode as you are moving your funds but they have been around for a while and are active in development being a wallet. Not something I would loose sleep over unless you are talking about a whole lot of money. And they you just chunk it out into smaller amounts.

I don't think a synology NAS is going to have nearly enough RAM or CPU power to run umbel. And then you have to open channels and to other work too.

-Dave