Personally, I would instead focus on finding small (read: less demanding/time sensitive) clients you can take on part-time - this gives you a client base to start from when you go full time on it, and some extra income until that time.
I was thinking of generating supplemental income with more scalable resource then hours. Even though it requires more hours, my hope is it will pay more going forward.
> I was thinking of generating supplemental income with more scalable resource then hours
That's a smart idea, but if your supplemental income is not from hours, it inherently requires a lot more up-front time, and will constantly require support, which will cost you time/money.
I am using Namecheap; there are tons of features it doesn't have that can be helpful.
https://www.hover.com - My initial destination for some domains after DNSimple (and would have been for more too) until the whole "oh you want DNSSEC? $500 per domain please" shit storm.
There are doubtless others - I'm not saying they are the best service, I have clearly found issues with both, but they're very much aimed at the "fuck this domain shit is hard can't someone make it easier" segment the market, who have different priorities than me.
I don't know what Namecheap does/doesn't offer as I've never used them - what sort of features are you thinking about?