I would ssuggest that the extra equipment you need should not cost a bomb .... some muslin cloth, some string to hang the cloth on, and whatever is needed to secure the string to walls etc.
Basically high gloss subjects reflect whatever they are mirroring so we provide an even wrap around to avoid reflecting what we do not want except for gaps in the surround to organise a black line [ assuming the room is dark compared to the light on the subject] One experienced tog suggested the black rolls of paper which his MF film came with.
Attaching a torch to the flash unit can help to show what it will do, though with digital trial/test shots are so easy to do.
This was taken in my bedroom back in the sixties with muslin, white card, sheet of glass and a couple of photofloods with the couple of high spots treated in editing now it is so easy with our editing programmes.
"after the party' or "I'm driving"
This is a copy off a print and originally taken with my MF Rolleiflex with the additional problems of while the pair of lens give focus and coverage at the focus distance you need a 'rack-up' arrangement to lift the camera the distance between the lens .. I used the rising column of my tripod ... today I am not sure it was worth the trouble
Altogether with the skills you have demonstrated here at CiC I think you could do a good job so long as you have the time to repeat shots which you feel are lacking.
Studio work takes time .. this took me a whole evening to rig and shoot [blind with film
] and so often we have heard of professionals walking in without the particular skills needed and doing an unsatisfactory job from the customers POV. And costing!