That sounds pretty safe. For one point of comparison, I would do the following:
1. List privately until the Model 3 shows up, and if it does not sell by then accept the $24,700 offer
2. ABSOLUTELY DO NOT try and sell the car to a distance buyer
3. Require a visit to the buyer's bank for payment, as described above
4. Ignore any buyer who does not immediately offer up a verifiable identify. Just asking for the personal Tele# is enough to weed out the lion's share of the garbage.
5. Do not get greedy. If a buyer raises any doubts, move on.
Good luck, and congrats on the Model 3 !!
P.s., am I understanding correctly that the $26k buy-out Honda is presently offering lets you skip the outstanding payments ? If not, you could try advertising your car on websites like swapalease that let you transfer the lease to another person.
P.p.s: <soapbox>Leases are a headache. At best </soapbox>