Your second draft is an improvement from the first one. Here are some suggested changes/edits.
Your Second Draft
Granting you access to the timeshare account puts me in an uncomfortable position since you removed my access to the hotel rewards account. A good compromise so that we both have what we want/need would be for us to both grant the other access to these two accounts. Does this sound like a reasonable solution? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Do you see that your opening paragraph is a "no" in so many words. This is what your H will hear when he sees the first paragraph and he'll say to himself, "There she goes again! Trying to control what I can or can't do! What a biotch!"
The last sentence leaves the implication that your H is/has being/been unreasonable. That will go down like a lead balloon. Right?
This is why we need to be careful of the words we choose to convey our meaning, intent and purpose.
Below is one that invites H to share the responsibility of making this work for the two of you without shutting him down. You are including him and yourself in this process. You are sharing the responsibility by the implication. See?
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Dear H,
Thank you for communicating your request to access the booking site for our timeshare. We both each have our own individual desires to travel when planning trips. How can we sort out our own need to access the timeshare bookings and hotel rewards account? Here is a proposal that we both allow the other full access to these two accounts. What are your thoughts? What ideas do you have?