the amp i have chosen for this exact task is a orange crush 35rt.. 35 watts, ss..
closed back 10" speaker, voice of the world speaker. there some thump with the closed back, its a well.made cab..
stock, the tone is ok-ish.. there a fx-loop.. i use a eq to remove what irks me..
the trick is to throw the original speaker in the trash where it belongs and replace it with the 10" celestion you prefer.. v30, greenback, gold, cream, vtype.. (8ohm is fine, the amp doesnt really lose volume)
... and while you're having the back open, drill a hole in the frame somewhere and put the new speaker on a switching jack.. voila : external speaker jack..
the best "practice" amp who can turn into a firebreather in a 4x12.
takes pedals and overdrive well. sounds somehow like a rockerverb.. not 100% like it, but you paid 10% of it for maybe 70% of the tone
imo. that's what im doing.
(tonex real sm57 capture of the amp here :
https://www.tone.net/tonex/tonemodels/10816)