TRA will accept NAR certifications so if you are a member of both and cert NAR, you are a L3 with TRA too. You could make.motors still
In a word...
No.
Tripoli research activities require active Tripoli membership at level 2 or higher.
Tripoli and NAR do recognize each others certifications, so if you go NAR for your L3, you'll just need to join TRA and send in a copy of your NAR L3 cert, and bingo... Tripoli L3. TRA research activities are a go.
The cert processes are so similar, some folks probably can't tell one from the other.
NAR changed the language in question. There is no longer an absolute requirement for disconnects between an altimeter output and the corresponding charge. It used to say that the battery disconnect "shall not" be enough. It now says the battery disconnect "may not" be enough. That is between you and your L3CC rep, and what he or she thinks is necessary to make your project safe. Basically, they don't want a charge going off at the RSO table, or while you're arming the bird at the pad. Some old altimeter designs had problems. Like charged capacitors still connected to ejection squibs. Make a boo-boo, and that charge goes off when you DON'T want it to... Even tho the battery was disconnected. That ain't good.
Get with your L3CC or TAP, which ever organization you choose. It all comes down to building it right, prepping it right, and getting the laundry aired out. And your L3CC or TAP is in the best position to advise you on all of that.
Good luck on the L3. Your L3CC or TAP can help you engineer failure out of the equation. Take advantage of that.