I have to disagree here. I ride lot of mountains and like fast descents/downhill’s. Though I don’t brake much (I am ex racer/track racer for years so more steering then braking). I never experienced the short life of latex inner tubes as you do describe. But I am a lucky guy since I don’t use my brakes much my rims do not heat up often.
To be secure you could opt to ride a pair of your light climbing wheels on which you put Velox tape over your Veloplugs. If the rim heats up the Latex inner tube will be shielded from the hot rim by the Velox tape. For your rear wheel that would not be necessary. Except if you are a guy that is using the brakes a lot.
Further I got the same experience as Danton has. Vredestein Latex blew up on me without reason. It happened randomly. Even when I did not have the Vredesteins on high pressure.
I think you're confusing a few things and misreading what I said in prior posts.
Other than that, if you think some cloth rimtape is going to insulate the latex inner tube from the heat of sidewalls of your rims, think again. It won't change one iot.
Think also about the fact that quite a few modern lightweight rims have thinly machined braking surfaces, American Classic being just one good example.
In that context I'd rather NOT recommend the use of latex inner tubes when planning on descending at high speed during a hot Summer day....
Of all the latex inner tubes the pigmented (coloured) ones are the more britlle ones. Pull one hard enough and it will rip. Pull a natural latex one and you'll find it will take alot more stretching before it finally slaps you in the face.
As for them being short lived, that's not really what I said but compared to natural latex they're notably shorter lived and far more prone to being pinched between the rim and the tyre when first mounted. It's no coincidence Michelin recommends the use of talcum powder to ease the mounting procedure.
Natural latex is far more slippery and doesn't need this.
As for the Michelins holding air longer than other latex inner tubes, some do and some are actually quite worse. No idea why.
Patching latex inner tubes is quite easy. Provided you have the right rubber cement you can even cut them in half and reglue them and they'll still work just fine.
Do use latex patches (cut from shot old ones) and round the edges for best results.
By using latex patches you don't intruduce foreign material with different elasticity. Butyl does work however if you must.
Don't ever scrape the punctured aera with a rasp or sandpaper, just clean it with some rubbing alcohol and you'll be fine.