Not quite what you asked for but that never stops me offering an opinion!
I went trad to wfp because I was trad then found out about wfp and went over due to advice on this forum about 4/5 years ago.
In your position I would start off wfp straight away and if cost is an issue then work with a trolley/backpack/small tank/barrels from the back of your car. Or on a trailer. Going trad to start (if you mean to end up as a f/t windy) is a waste of time and therefore money.)
Modified to answer your second post:- It can cost less than a grand if working out of an existing estate car or adding a trailer and if you do most of the building yourself - allow a week to do it. If you go straight for a van then add the cost of your van to that grand.
If you want a better pole, RO etc then maybe £1500.