the Medela electric pump seems to be available in the US, is has adjustments for sucktion strength and interval. However, it is also working with a rechargeable battery. I haven't tried it but you may have to recharge as well as the Cellulite massager. Other potential electric pumps are those that are used for small fish basins. The are to bubble fresh air through the water, but some have a tube inlet where you could attach a small hose, 1/4" or so. On eBay search for "Medela Pump in Style". You also find other pumps that run on 12V or 24 V, but you would need to DIY some, e.g. connect it to a car battery or other 12V supply. Some pumps do a vacuum of 50 to 65 kPa, which is more than sufficient, so you may wish to install a bleed valve to adjust the vacuum. But then, there are not interval pumps.
Kepp us posted on your progress, thank you,