I dont think its a good idea - that is what you ask, and not HOW, right?
You would be better off finding some friends, and buy or borrow a bigger board for starters.
Without ever having wingfoiled, nor windfoiled I assume - starting on a 30 litre board in 30 knots for learning
It is a bad idea IMO.
Cant say for sure, just my feel about this.
Even when learning with big wing and board, some things CAN go wrong.
A lot worse trying in mega high winds learning for the first time on a sinker
Most likely also too difficult, so two things are against the idea
Big boards can be bought used for small money, and sold again, because people start with weight+20 to 40 litres, then go down to something like weight +5 and either (most) stay there, or go smaller, or have several boards.
You could use a SUP, and learn to handle the wing in high winds first - but I still think it is a bad idea not to learn to wing on a bigger wingfoilboard first.
How many windsurfers learned on a sinker as their first board?
Windsurf and wingfoils are too different, so not much use from the windsurf sinker experience we got - a bit yes, but not that much.
You could also just try and see if you manage - but odds are against IMO.
You have no wing "handling" experience now, and when learning you need really high wind to be able to ride, let alone waterstart.
The better you get, the lower wind you need - but technique and experience is everything - and this is something you learn pretty fast on a bigger board without the same risks.
Peter