Yes, a 46 2-stroke will power it very nicely.

But should you decide to go 4-stroke, about all you need to know is this:

Use 15% fuel with synthetic oil

Use an OS "F" type glowplug (Which will come with an OS 70)

With a plane like the decathlon which has a cowl, Before starting, remove the vent line, hook it up to your fuel pump, and pump fuel into the vent for a second or three. That will force fuel into the carb for a prime. (If you use an electric starter, you may not even need to do anything in the way of priming)

Outside of that, a 4-stroke isn't any more difficult than a 2-stroke with one possible exception...

OCCASIONALLY you may have to adjust the valves on a 4-stroke. I have only ever needed to do it once, and I own a BUNCH of 4-strokes. IF (and that's a big "IF" ) you ever have to do it, it's a simple proceedure (VERY simple) and the manual will give you step-by-step instructions.