Here is why I think using a cable clamp is relatively safe.
1. Quick release
2. Pressure gets too intense or color or feeling starts change simply unclick 1 or 2 teeth. Let it subside a bit then retighten some.
3. As long as you release the clamp every ten minutes to regain some fresh blood I can surf the ebbs and lows for 30 min easy.
4. Most unsafe clamping is overtightening the clamp by using stupid force versus a comfortable yet snug setting. Allowing a super tight clamp to remain on for an extended time duration.
I use a simple 1 inch wide silicone sleeve and clamp over it. Super simple.
Is clamping dangerous, can be. But so can any other activity on planet earth.
Ive been hanging over a year and literally just gotton a suberb wrap and hanger strategy. Trial and error guys. Also, PE is not for the faint of heart. You will not add inches by not doing the work.