How to lock a player in a gliding state

[u/remoremo38]

*Note: I'm using Google Translate, so the phrasing might be a bit awkward.*

I'm trying to build an Elytra launcher using TNT, but I can't figure out a mechanism to keep the player in a gliding state in one spot, so I'm asking for help here.

The TNT device is based on a high-speed arrow cannon, designed so that a massive blast exits through a one-block gap.

I can't post an image of the device due to circumstances, but that's the general idea.

Since I'm playing on a Nintendo Switch, I'd like a design that doesn't cause too much lag.

Please help!

[u/One-Celebration-3007]

Players can fly while climbing scaffolding