Which is exactly the same thing I said, I double checked that my post did go through LOL, exact advice that I gave except I wouldn't necessarily use a pigtail if you're going to use a pl-259 in a mobile or rooftop application, I would use the adapter shown above. It's only one piece of hardware but you still have to be careful. Multiple adapters attached to each other as you were referring to on a portable BNC connection is not a good idea as I have already posted.
When I use my sds100 in the car paired with my Larson tri-band I simply use the adapter above. Just be careful.
As far as your native connection on your radio it is a BNC connector as I said in my post and as I recommended, you need to get an antenna that has a BNC connection if you're going to attach it to your radio.
Sometimes I think my posts just don't go through 😆😆😆 or I guess people post in a thread without reading any of the other posts already in the thread. Whatever.
Good luck op with whatever choice you make, maybe let us know what you ended up doing.