Hi Richard sorry about the late reply I've not been on this thread for week or so.
All I can do with jardini tankmates is point you in the right direction as every tankmate can be a potential gamble with jardini there not picky killers lol
I have always managed tankmates with all the jars I've kept over a period of nearly 10 years , I've also spent a small fortune on tankmates over the years to have them killed or shreaded within a few hours in some cases. Some of my buys have been stupid ones (putting fish in that are way to small or have no attitude to defend against angry jars) but I have had some success story's lol , cichlids don't work well they can live together but there's constant battles for territory so if your jar wants the whole tank it'll get the whole tank
Try decent sized bottom dwellers catfish mostly , armour plated get left well alone (irwini , Niger ) none of my jars have ever bothered with them.
I too have got an ornate birchir that my jars haven't killed its lived with two of them now no problem (be careful putting a small jar in with a 10" one though or the problem will be the other way around

)
Some jars accept silver dither fish like sd's ot tfb's other seem to target them constantly untill there rid of them.
I've been told clown loaches work well if there to big to be eaten , I've not tried this though as there very expensive in the UK these days and can't afford that gamble.
Like I said at the start of the post everything is a gamble depending on the individual jardini you end up with , some fellow mfk's have got lucky and kept them in community setups with no aggression even in multiple jardini tanks.
I'm yet to strike lucky on a placid jardini all mine have been relentless killers


Good luck