Sorry, but planning for your results to only look good into your 30s isn't realistic, if by realistic you really mean "is this a good plan". No, that plan is not good.
Also, guys shouldn't get a transplant with the hope that 'future treatments' will fix the planning mistakes they might be making right now. I remember when the TV science show "Nova" talked about breakthroughs in hair loss treatments, which could be available quite soon. They talked to Dr George Cotsarelis (I even wrote him a letter after the show) and Dr Angela Christiano (names who are still active in hair loss research). That show aired in 1990... 25 years ago. For all we know, it might be another 25 years for a new treatment. Also, for all we know, previous surgery might make a future treatment less effective. Hair transplants create scarring in the donor area and recipient area... even FUE. Hair transplants are a type of skin graft which just so happen to contain hair follicles (I hope everybody understands this by now) but the skin grafts go into the deeper scalp tissue, and cause scarring which disrupts blood flow. For my own sake, I hope transplants have no impact on future treatments. But nobody knows.