Doxy should be fine. The problem I've had with bart is that it tends to be resistant to many antibiotics, but is usually not resistant to doxy/mino.
You might want to also take something that will hit the dormant form (kaletra, valproate, disulfiram, nitroxoline were mentioned in the other thread, see also
https://pubmed.ncbi.nlm.nih.gov/31035691/)
I'm not sure exactly what mepron does to bart. When used alone it seems to have little effect, but it seemed like other antibiotics were more effective against bartonella when I was also taking mepron.