Well, ofcourse UHF is perfectly fine. N is also perfectly fine.
I guess UHF will take more power but for HF unless you do
run a 4 by 5 at full blast N will be ok, N will take several KW´s
on HF bands year in and year out. If one runs "serious" EME
power on 144 MHz N is not a good idea but then again I know
people runing 2 - 3 KW´s using N connectors with no problems.
Also the loss or impedance deal is no issue at least below
400 MHz. I once years ago did measure UHF N and other
connectors and nothing of any bigger significanse happens
untill you move above 400 MHz so for 144 and below dont
worry to much.
Finaly on the installation bit. Like anything else it has to be
done right. I dont think its any harder installing N´s then UHF´s.
However I dont solder any more, always use crimp connectors.
73, Jim SM2EKM