He is approximately 3 years old, give or take, as he is a rescue and we don’t know his…

Hi, I’m looking for advice about my cat who has feline asthma. He is approximately 3 years old, give or take, as he is a rescue and we don’t know his exact age. He is white and has black spots I live in a remote/desert area of Algeria. Most of the veterinarians available here mainly work with farm animals , so they don’t have much experience with feline asthma, inhalers, or spacer therapy. There are also no veterinary pharmacies where I live, so if an inhaler is appropriate, I would have to obtain it from a regular human pharmacy. My cat has asthma attacks from time to time. At the moment, the treatment our vet gives him is corticosteroids for the first 5 days of every month. Despite this, he still sometimes has attacks. He is also extremely skinny/underweight. His abdomen looks very sunken in, even though he eats very well and has a good appetite. Our vet told us that because of his condition, it may be difficult for him to gain weight. He also has very noticeable abdominal breathing when he breathes, his abdomen visibly moves in and out with each breath, almost like contractions, rather than breathing mainly with his chest. I would like to ask a veterinarian experienced with feline asthma whether there is a safer or more appropriate long-term management plan, particularly whether an inhaled corticosteroid such as fluticasone and/or a bronchodilator such as salbutamol/albuterol could be appropriate for him. If inhaled treatment is appropriate, could you please tell me what medication and type of spacer/mask are normally used for cats, and what I should ask for at a human pharmacy? I understand that online advice cannot replace an examination, and I’m not asking for a prescription without proper assessment. I mainly need guidance because access to feline respiratory specialists and veterinary medications is very limited where I live. Thank you very much.