limiting the tenure of individuals as you propose or by any other means to my knowledge is not possible;
Owners corporations can’t limit the tenure of committee members. The right to be elected to the committee is granted to all owners via the Act and resolutions of the owners corp can’t overturn the law.
What you can do is to check that they are entitled to stand by looking at the Act and regulations closely and seeing who might be invalid – and having alternative candidates ready to go. In my experience, these committees get very slack once they’ve been in power for a while and forget to line up their nominees and make sure they are all “financial” or validly nominated.
Just don’t telegraph your plans too much and make sure the elections are carried out according to the Act – blank sheets of paper and all that.