N-Methyl-formanilide (correct spelling) is not a List 1 chemical. What I believe you would have more problem with would be the aquisition of POCl3, as it can be used in the manufacture of Sarin/Tabun war gases.
What chemicals DO you have access to? You should be able to formylate 1,3,5-trihydroxybenzene with CHCl3/KOH (Reimer-Tiemann) or 1,3,5-trimethoxybenzene with dichloromethyl methyl ether and a medium Lewis acid like SnCl4 or TiCl4.
If you haven't already, read https://www.thevespiary.org/rhodium/Rhodium/chemistry/formylations.html (https://www.thevespiary.org/rhodium/Rhodium/chemistry/formylations.html)
- you'll find many formylation ideas there. Don't miss the Magnesium Methoxide/Paraformaldehyde method either.
Phytochemistry 37(3), 755-6 (1994)
Phloroglucinol glucoside was identified from shoot laticifer exudate of Cannabis sativa (marihuana) by TLC. Isolation of the aglycone from acid-heat hydrolysis or emulsin treatment yielded the free phenol, phloroglucinol (1,3,5-trihydroxybenzene), as identified by GC-MS and NMR. Phloroglucinol also was identified by TLC as a prominent component in glandular trichomes.
Entropy just isn't what it used to be.