Interesting that this came up, we discussed this at my homebrew club meeting last night. The consensus among the people that regularly do this was to make a starter using crushed grains. The next best thing was the Omega blend, but it was hard to come by.
We did a tasting of berlinner weiss from one of the club members that won BOS at the Queen of Beer comp in california. She won with a strawberry rhubarb berlinner. It is fecking fantastic (obviously). We compared her standard berlinner with a renowned one called Athena (https://www.creature...eer.com/athena/). The Athena was perfect. It's absolutely the definition of a standard berlinner. Everything is in proper balance with that beer. Mary's standard was noticeably more lactic, but the strawberry rhubarb had that same perfect balance.
A couple notes... use some lactic acid to get the wort into the right PH range for the starter. She does nothing to worry about O2, she just covers the kettle. She uses a 1.5 qt mason jar for the starter and puts it in a small water bath that is kept at 90 degrees (I need to check that temp) with an aquarium heater. I'll get the notes from the meeting and post them in a bit.