"Work" is a relative term. You're essentially talking about 1 use year and when the next one starts. All the other costs, including the prorated dues are the same under any use year purchase scenario.
Say that you go with a March use year because that is what you want to have. They will take your 2023 points and you get the first batch of points to use starting March 1, 2024 - about 8 months from now (that's better than a June use year where your first batch of points would be usable about 11 months from now). How much does that matter to you? Will you need to rent points until then? Are there any other expenses involved because of the relatively bad timing? If not, then I'd think of it this way:
You can either:
1) Do the deal now with a March use year and MB. Get first batch of points to use from March 1, 2024.
or
2) Do the deal in Feb 2024 with a March use year and MB. Get first batch of points to use from March 1, 2024.
Your timing in Feb 2024 will be "perfect" for MB, but how did that affect the outcome? You still got the first batch of points starting March 1, 2024. Assuming the deal in Feb 2024 is exactly the same as it is now, then the only difference is the timing on when you make the purchase which affects (i) and any potential interest/gain you might earn by keeping your money invested for the next 8 months (maybe $800-$1000) and (ii) saving 8 months of prorated annual dues (about $750 on 150 points). Otherwise, it really doesn't matter financially. But if you wait until Feb 2024 then:
(i) the deal might be worse,
(ii) MB may be discontinued,
(iii) the resort may sell out (if considering VGF), and
(iv) the 2024 points would mostly apply to 7-month reservations, unless you book for late 2024 and beyond.