Sorry, I forgot that 75 would be your 'master contract' and the minimum direct is 100 right now. The 100 and 50 split would still be beneficial to you if you ever wanted to sell some points off. You could always sell the 100, keep the 50, and never be told you need a minimum 100 point purchase (or whatever it is at the time) since you are already a member. The closing cost is minimal in the grand scheme of things.
I was fortunate with the original guide I was assigned. He "retired" over COVID and IDK who was assigned to me. I blindly reached out to another guide a friend said was easy to deal with and as soon as I spoke with him on the phone I got an email that my guide was switched. You can absolutely switch, but it could be from pan to the flame... possibly even worse? Getting "manager" approval or dealing with your guide's manager may be the best way to go for now if you get the Oct UY, 100/50 split, and whatever financing or payment plan you want. You can always pick a new one based on WOM and/or a visit to WDW.
I believe even if the 50 points were sold membership extras would be lost.
DVC is selling 100 minimum, but 150 direct is still required for membership extras as of 6/3/21.
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Important Information about Membership Extras:
Membership Extras, such as exchange options in the Disney Collection and options offered through hotel exchange, certain discounts, offers, and special events are incidental benefits. These incidental benefits are subject to change or termination without notice, may require the payment of a fee and cannot be combined with any other offers or promotions. Membership Extras are also subject to availability and block-out dates may apply, including high periods of demand such as Christmas and New Year’s Day. To receive any Membership Extras, purchasers must present a valid digital Disney Vacation Club Membership Card along with a corresponding valid photo ID.
Effective June 3, 2021, to obtain a Disney Vacation Club Membership Card, Members must accumulate a total of at least 150 Vacation Points purchased directly from Disney Vacation Development, Inc. Exchange options in the Disney Collection and options offered through hotel exchange are not available for ownership interests not purchased directly from Disney Vacation Development, Inc. after March 21, 2011, and, effective April 4, 2016, Members who have not purchased an ownership interest directly from Disney Vacation Development, Inc. will not have access to Membership Extras."