Break Question/Advice LSP&BV

So long story short I was replacing a hard break line and everything was going great, got it all swapped out and was excited that I finally got something fixed in under an hour. Decided it would be wise to bleed the breaks so like any one I started with the LSP&BV. Got it bled and was tightening the bleeder valve closed as the Fucking threads on the bypass valve cracked... Not all the threads were busted off, but I am unable to get the bleeder valve screwed on. I was able to screw a same sized bolt in enough to plug the hole and also added some pipe dope/gasket maker to the threads to help it seal. I bled the rest of the breaks and took it for a test drive, Breaks felt great and as far as I can tell theres no leaks coming from the LSP&BV.
My question is 1: What would happen if all of a sudden the bolt that is replacing the bleeder valve on my LSP&BV was to come out well driving.
2: If I keep an eye on making sure the bolt is tight and sealed would you say it is relatively "safe"
3: Is Break fluid Flammable? if I was to try and weld a nut onto the LSP&BV so that I could screw the bleeder valve back on.
Thanks in advance for all helping me question my judgement...
Let me know if you want/need pictures to know what I'm talking about.

 

Not clear on what exactly broke.

The threads in the bleeder hole on the LSPV (female) .... or ....
the threads on the removeable bleeder screw (male) ?

 

The outer half of the female threads on the lsp&bv cracked off leaving about >1/4" of female threads (still in the bleeder hole) that I am able to screw a bolt fairly snugly into.

 

time for helicoil *not recomended

or a tap and die on the female end and go slightly larger, however most are the same/similar size.

AVOID teflon tape/gasket maker, ANY type of shit in the lines/sytem can and will affect the brake system. many fail to realize how fragile of a system it is. Its amazing the difference between the average or even new system, and a built, solid, well maintained system.

OR, start replacing parts. just my 2cents.