I've seen comments on PPRuNe that suggests that leaseback will not give you that access you want - clubs need a certain amount of predictability in their access to the a/c.
I'd suggest that it would be worth tracking down a complex a/c (VP or Retractable) that you can rent in your area - and fly it as often as you can - even if a C152 would do for a particular trip. Reasons?
1. You are more likely to be current when you want to take a trip at short notice,
2. You will a "good customer" for the owner, who will be more inclined to allow you to take the a/c away for longer,
3. You will be safer flying your 'regular' aircraft than you will flying a 'hot-ship' that you only use once in a while.
4. A complex a/c is likely to be more available as fewer pilots will have the qualifications to fly it, and the a/c will tend to be used for touring anyway, so your requirement for access to it will be more normal.
By the time checkouts are paid for, flying a complex ship all the time, is not likely to cost alot more than flying a simple one based on a small number of hours.