Exactly and I would have the same long term health fears , from using any chemical impregnated clothing.
Safer just to check yourself carefully after each outing, better still if you have a partner that can help check any difficult to see areas ,use a proper tick tool to remove any ticks found.
There is very little danger from ticks that have been on you for less than 24 hours, genuine cases of Lyme disease
are almost invariably from ticks that have been attached for longer than that.
Lyme disease is very nasty(had it twenty years ago) but working s a full time stalker in an area with a large tick population where it was not uncommon to find twenty plus ticks attached after an outing, I was probably at more risk than many are,but I believe the answer is diligent inspection followed up by a visit to the doctor at the first sign of any symptoms, rather than the use of chemicals with unknown long term health effects.