Multi-region (US vs EU): charger differences, VAT for camera buybacks?

Camera retail has more region-specific complexity than most ecom. Three things to model:

• Charger SKUs, US/JP cameras ship with NEMA 5-15 (Type A) charger; EU ships with Schuko (Type F); UK ships with BS 1363 (Type G); AU ships with Type I. Some bodies (Sony, Canon higher-end) ship with USB-C only and no wall adapter at all. Model as a charger-region product attribute; show only the correct charger on the regional store view. Don’t do “adapter included”, pros hate it.
• VAT on used + trade-in (EU), this is the gnarly one. EU dealers can use VAT margin scheme for used goods: VAT is charged only on the margin (your sell price minus your buy price), not on the full sale. Saves ~12-18% on used pricing vs charging full VAT. Requires per-item record-keeping (buy price + sell price + serial number). Your Magento custom module needs to compute this per-line at checkout for EU stock. Worth the build if EU used is >15% of revenue.
• Multi-Source Inventory (MSI), separate sources per warehouse (US-NJ, US-CA, EU-NL, UK-MK, AU-VIC). Stocks aggregate sources by region. Customer geo-routes to a stock; the stock shows accurate availability.
• Pricing + currency, separate store views per region. EU in EUR with VAT-included prices; US in USD with tax-excluded; UK in GBP with VAT-included; AU in AUD with GST-included. Same SKUs, different price visibility, different checkout (Klarna / iDEAL / SOFORT in EU, Affirm / Apple Pay in US, Clearpay in UK, Afterpay in AU).

This is multi-week build territory, budget $12k, $30k for a clean multi-region setup with the VAT margin scheme done right.