Yea that'll be fine.

A few considerations -

1) use very small cable ties and don't crank really hard esp if its an old kite otherwise you are in danger of breaking the valves.

2) use a fresh Stanley blade and you can flush cut the cable tie so there won't be a sharp bit of plastic to worry about ripping the canopy. That way no need to tape them.

3) position the locking part of the cable tie facing away from the canopy if still worried about abrasion

What make is the kite?

Possibility I may have some retainers in the workshop and if I don't I can advise if available from o/g manufacturer and/or aftermarket

Cheers
Ryan
The Sail Doctor
Kite, wing and sail repairs

..... you westys are ****n just that little bit different aint yas

we always sanded the fresh cut ziptie ends down to smooth