1. I'm not sure I understand what︁ benefits that would bring, but I also don't see any problems with it. Would probably︂ depend on the exact nature of the set up. Something for a lawyer to advice︃ you on.
2. 18% VAT is the VAT rate for most domestic sales within Malta.︄ For sales to other EU/EEA members, you need to (after a threshold is reached) either︅ pay that country's VAT rate to that country or use the aptly named VAT MOSS.︆ If you're new to EU, I'm afraid you have a lot of reading to do︇ about VAT. If you're selling to Latin America, you won't have to charge VAT.
3. Yes, although most people structure it as loans or other forms of payment (such as︈ invoicing as consultants) rather than salary to avoid payroll overheads.
4. It's usually faster than︉ that. The IRD isn't consistent but the rebate is usually paid back within a few︊ days to a few weeks.
5. AFAIK, no problem but always better to discuss these︋ exact details with a lawyer.
6. WH Partners, HBM/E-Management, Chetcucti Cauchi, Calamatta Cuscheri, and CSB︌ are among the most well-known ones. Then there are dozens of more boutique firms.