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Sounds like a good idea! What about storage options? I also came across this; is it legit? https://www.cjs-cdkeys.com/categories/XBOX-Games-%28Digital-Downloads%29/
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if you want keys cdkeys.com is the best but with console games make double sure it's not an account you're buying not just the game key.
Storage options, you can connect an external HD to the xbox to store games but you need to move them to the internal drive to play them, or pay for a proprietry expansion card, that's one the main downsides of the xbox compared to the playstation, it's about £130 for a 1Tb stick. -
CDKeys is 'legit' as in they'll deliver working keys. Not sure how they acquire them.
A console without a disc drive is always going to be more expensive because you'll have to buy from restricted marketplaces unlike just picking up a disc off Ebay.
However, if you don't mind subscriptions then gamepass (xbox) is the best service available for cost vs game choice.
Get an xbox series S, get gamepass.