I completely understand your thinking on this, evoman.
In fact, it is one of the reasons I made the base kit a TKL configuration. With just the addition of one kit, the numpad, you are covered if you ever want to redeploy Dasher to any of the three most common platforms: 60%, TKL, or full-size.
Given how infrequently SA sets get re-run--due to SP's limited manufacturing capacity and the insatiable hunger the community has for new sets over old ones--it is highly likely this will be the only chance we'll get at this. Better to stock up now than to regret it later, after its too late, and your only hope is to find what you need in the classifieds.