Yep. Start by muxing each item into its own BD folder (not iso yet). I like ClownBD for this, since it does the best job of demuxing before remuxing, but tsMuxer will be fine too.

Then drag your folders into a new MultiAVCHD project. It will ask each time if you want to reauthor them: say no each time.
When your folders are all listed in the order you want them, hit the ‘merge’ button in the middle - this will save everything as a new BD folder with a combined playlist. you DO need to do the final BD assembly after this (click the main ‘Start’ button and select Blu-ray disc) but this should take a matter of seconds if you’re saving to the same HDD.

Note that this process only produces a Blu-ray folder - no problem if you want to burn to disc, but if you need an iso version you can use imgBurn to convert.