Agents often charge much less the second time so may be stay with the same one or better still do it yourself legally at you local office as I did once I had the funds sorted.
yes you can and I did. Nobody checked my bank book or statements to see if I had met the requirements for my last visa. Maybe I was lucky. Same when going to monthly transfer. Nobody checked the money had been in the bank to meet the requirements of my previous visa based on funds in the bank. Maybe I was lucky again.