Ime i actually used the Lemon EO with some full spectrum Rue extract each time i took it to block out the nausea/vomiting long enough to build up the Harmala reverse tolerance, so yeah ime at least it's certainly doable. Me personally, when i was taking Harmalas regularly it was a nightly thing, so i'd take it every night, but a few times a week like 3 to 4 times a week, maybe even as little as 2 times a week (not sure though) would be enough to build up the reverse tolerance. It usually took me about a couple weeks iirc for the Harmala-related side-effects to clear up/go away, and the Lemon EO, like Lemon Balm does, cleans up how the Harmalas/Rue feels so it wasn't like i had to suffer through it much, a lot of the undesirable effects were blocked out and when the reverse tolerance was built up i stopped taking the Lemon EO and the Harmalas/Rue felt as clean as it usually does when the reverse tolerance is built up.
Also as the reverse tolerance builds up the Harmala/Rue dosage gets stronger and stronger, so what i would do is take the same dosage until it gets too strong, then back the dosage down a little bit and continue on until that dosage got too strong, back the dosage down some more and keep doing that, eventually i only needed a little bit of Harmalas/Rue for a full on dosage, so it saves on plant material in the long run. With Lemon EO or Lemon Balm with the Harmalas/Rue though, it can be a bit difficult to determine how strong the Rue/Harmalas are because the Lemon EO, and Lemon Balm, both clean up how the Rue/Harmalas feel, but for me i can still tell when things get a bit too strong because i can still feel some of the bodyload but it feels much cleaner compared to how it'd feel without the Lemon EO or Lemon Balm.
Just keep in mind this is all experimentation/trial and error, so it can take a few tries and dosage adjustments to really figure things out and get things down right, you learn as you go along, so if you mess up somewhere don't worry just make some adjustments and keep going
Edit - Also keep in mind that the more regularly the Rue/Harmalas is consumed, and the higher the dosage of the Rue/Harmalas, the faster the reverse tolerance will build up, the less it's consumed or the less the dosage, the slower it'll build up.