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Having got a very cheap router from Rutlands, I can’t say I’d give them a singing recommendation. Just buy a proper tool.
Nef-
I've no idea about the quality of anything other than Festool these days so you are right to point out the cheap Rutlands stuff might be crap.
I bought the Kapex when it was first released but like your experience of the big Bosch I've found it very heavy. It's also a difficult shape to manoeuvre. The smaller mitre saws never seem to be all that worthwhile in the quality of results once you've got used to the Kapex though.
I know you pretty much recommended the pull saw in the first place and that's what I would use if it's all I had. I do have a lot of experience with a pull saw though so the results are pretty reliable. For some reason I had assumed they wanted to rip the oak into lengths.
Airhead
Search for Skill Saw, you should see some around the £80 mark. Then get a straight bit of wood and 2 clamps, run the saw along the clamps.
Ideally I would have you ordering a smaller track saw from somewhere like Rutlands :-
https://www.rutlands.co.uk/sp+power-tools-bench-circular-saws-plunge-saws-110mm-plunge-cut-saw-with-1000mm-guide-rail-rutlands+xt3510