Am I entitled to consider the entire amount as a debt owed by my friend who has not repaid my share of the loan, and am I legally permitted to demand that the guarantors pay these amounts?

You are not entitled to consider the entire amount as a debt owed by him, nor to charge him the bank's profits on your share. Rather, he is obligated to pay his share and its profits to the bank, and you are obligated to pay your share and its profits. He is also obligated to pay the debt he owes you. It is not permissible to charge him for the bank's profits related to your share due to his procrastination or default. He must fulfill the contracts and not procrastinate if he is solvent. If he is insolvent, he should be given respite. It is permissible to demand the debt from the guarantors.