You should be able to buy a replacement pickup screen assembly from one of the online dealers.
With enough money and adapters anything is possible.
Suction side filter is more prone to letting in dirt or air thought a leak.
Pressure side filter is more prone to leaks and need better seals, connections and filters.
Either one should probably be installed as close to the tank as possible.
Personally I would likely install a suction side setup. You ma have to replace all the hard line pipe from the tank to the pump but as long as you use a hose that is rated for suction, it should work. As for size of hose, on suction when in doubt, always go up one size for better flow rate.