OK, I took a look at RPGVX, and here's what I've found so far.
Making Effects are still fairly similar.
You still need two identical items.
One should have occasion set to "Always" or "Only from the menu"
The other should have occasion set to "Never"
Consume is set to "No"
Instead of flipping a switch to activate a common event, just call the common event directly from the item. The script should have the trigger set to "None".
RPGVX doesn't seem to have a command to check what buttons are being pressed, but you can still set a conditional branch to check if a specific button is pressed and then react appropriately. Though you seem to have less options on which buttons to use.
Move Event is called "Set Move Route" but is otherwise the same.
Changing speed is still handled with "Set Move Route - Player, Change Speed", but in RPGVX you set the speed to set values (2x faster than default speed, 2x slower than default speed) instead of relative values (faster than current speed, slower than current speed). This makes it easier to reset the speed to normal.
"Lock Facing" is now "Direction Fix ON". Remember to turn it off afterward.
"Increase Transparency" is now "Change Opacity" and is set to specific values instead of relative to the current value.
"Screen-Relative X" and "Screen-Relative Y" are just "Screen X" and "Screen Y".
The number to subtract from "Screen Y" might be different in RPGVX.
Rotating the picture is a seperate command, just use it after showing the picture.
I'm not sure how to make the picture scroll with the map, if anybody knows, then your help would be appreciated. I'm sure you could do it easily with scripting, but I really have no experience with it.
RPGVX doesn't play a sound when you walk, which is somewhat inconvenient. You could probably script it to, but this seems like it'd be a pain, especially if you wanted it to play specific sounds based on the tile. Again, help would be appreciated.
Though once you do get it to work, you could just check the "Riding your broom" switch instead of changing the tileset.
-----THINGS I'M NOT SURE ON:-----
How to make a picture scroll with the map.
How to make a sound when you walk. And how to make that sound depend on the tile.
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Everything else seems to still work the same, though I haven't thoroughly tested it all.
If I haven't covered your problem, and there's still something that you can't do that I've missed, please feel free to ask.
Also, I only looked through this quickly, so if I've stated something incorrect, then please correct me.