I think that you should be able to buy with a centralized exchange you know will have legit securities, and a decentralized option that would save you money.
Sure, you can use the exchange with the legit securities. It neither needs nor wants governmental interference. This alternative "option" you speak of that can "save you money"
will never achieve said goal in the sense that so long as something is a play exchange that hosts play securities, you're no longer in the realm of finance, but of playing pretend. You can represent some pittance you managed to snatch for yourself before some poor guy got left holding the hot potato as "having saved money", but again, this is playing pretend. Taking it seriously and involving it in discussions about the actual exchange silly at best and very, very dangerous for your wallet (and I suppose your overall well-being, etc) at the worst.
You could easily list your security on both the decentralized/centralized exchanges offering both options while knowing that the security has met the regulations set in place to protect investors.
Stuff doesn't really work this way. Have a look at
a real IPO, specifically section 3.2 (a). This, by the way, is (part of) what makes a legitimate security; not some scammer "creating buzz" about it, not some earnest but sadly unproficient guy supposing it looks okay, not a few determined but incapable people "voting it in", and not Nanny Gov saying it's okay.
Im not 100% sure I understand what you mean but I think you are saying that it is impossible for bitcoin securities/exchanges to get registered with SEC. And the gov is not regulating BTC in that case they are regulating SECURITIES. They don't give a shit how you pay for your investments, they just want to make sure they comply with the laws that have been in place for 50+ years.
And is it impossible to register with SEC or is it that nobody has even tried because they like to pretend that by saying bitcoin is "virtual currency" they can get away with illegal activities.
I tried to select a specific chunk to quote for you, but you'll have to read the whole thing:
The reasons why Bitcoin securities cant be regulated by the SEC.