MIC generic spreader? Ebay should have them.
Alternative for tall tripods you may want to look at the Sachtler SOOM tripod (I'll love to get one!). But will burn big hole in pockets, and a damn heavy piece too. The local agent is Broadcom (in Bukit Batok) if I'm not wrong.
Alternatively, you may want to prop up your tripod with stools from Ikea (those with rubber leg pads)? Can gain a good 30cm height with stability, but zero mobility. Cheap and good solution which I use to go above audiences' heads for concerts with a manfrotto 055 at 2.2M height. Buy 4 stools (1 for yourself). Less than $50.
For the VGA to RCA adapter or vice versa, go to Sim Lim Tower. There are shops selling it (sorry, forgot the unit numbers). Sim Lim Square has it too (3rd floor, UF Technology, but only VGA to RCA I think).