torn bough
Currently access to West Hyrule is via bombs in north eldin or gate key at faron Logically.
Currently you can access West Hyrule by doing Hot Spring Quest anytime (barring twilight requirements).
- Could Hot Spring Water Quest be locked behind Gate Key?
Theres been talks of the rocks south of south castle town being removed when you obtain Gate Key,
- Could obtaining Bomb Bag be included?
suggestion ;
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to also have the Hot Sprig quest pre-completed, either at start, or when Gate Key is obtained, or Bomb Bag obtained. No donation of the initial 500/1000 and possibly the 200/2000 to move the shop.
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reduce the initial 2000 to 200 to open Castle Town Malo Mart (meaning Hot Spring Quest can be skipped).
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have Hot Spring quest (possibly all expensive checks) require a Wallet logically as a possible hint.
I apologize if this has been discussed already 
unborn acorn