Hi Spen, you can leave the VTX there....just don't take out your monitor or goggles and you'll be fine.
5.8Ghz on the AVL58 signal is fine in Singapore....it's more for those using FPV equipments on 900mhz or 1.2 ghz bandwidth as that interferes with other radio equipments. If I'm not mistaken, the limit for 5.8Ghz in Singapore is 1000mW (
http://www.ida.gov.sg/~/media/Files/PCDG/Licensees/StandardsQoS/RadiocomEquipStd/TSSRD.pdf), most of us are using VTX way lower than that (AVL 58 is 500mW, Immersion RC is 600mW, the BOSCAM ones range from 200-500mW).
Most professional aerial video services here flying Hexas and Octos carrying DSLR uses 5.8gHz on their Multi Rotors from what I've seen and they have flown at quite a few places around Singapore.
The only worry using 5.8gHz is that anyone with similar equipments can tap into your channel and view what you're recording. Or worst, you can also accidentally be looking at other's FPV camera while flying if they are nearby and on the same frequency. This is scary if you're flying far and out of sight and you'll have no idea which direction your MR is facing and where it is because what appears on your monitor is someone else's camera POV when they power it up near you.
The safest will actually be the Lightbridge as it uses 2.4Ghz encrypted anti interference signal so no one can tap into your channel nor will you stumble on other's channel or camera view.